🗣️ 3. Syllable, stress and intonation

Ukrainian stress is free and mobile. Free: it can fall on any syllable of a word, and nothing in the sound shape of a word predicts where. Mobile: in many words it moves from one syllable to another across the forms of one paradigm (рука́ 'hand', ру́ку acc., ру́ки nom. pl., руки́ gen. sg.). Stress alone distinguishes words (за́мок 'castle', замо́к 'lock') and forms (пла́чу 'I weep', плачу́ 'I pay'), and it is not written in ordinary text. This makes it the single largest gap between Ukrainian spelling and pronunciation, and the hardest part of any speech or pronunciation model. This chapter describes the syllable (§1), the nature of the stress (§2), lexical and grammatical minimal pairs (§3), stress in the paradigm (§4), variant stresses allowed by the norm (§5), the norm and usage (§6), stress in compounds, loans and clitic groups (§7), stress in language technology (§8), rhythm and intonation in outline (§9), and what Mova does (§10).

The sources are Smal-Stockyj (1913 §5, §§17–25), Simovych (1919 §§8–10), the stress marks of the 2019 orthography (which marks the stress on almost every example word), the review of the orthoepic dictionaries by Bas-Kononenko (2019), and, for counts, the stressed headwords and stress-type codes of the Ukrainian Wiktionary (dump of 2026-09-01; CC BY-SA, counted only, nothing copied).

1. The syllable

1.1 Every vowel is a syllable

A Ukrainian syllable has exactly one vowel, and every vowel letter (а, е, и, і, о, у, я, ю, є, ї) makes one syllable: ма-ма, ко-ло-дязь, Ма-рі-я. Simovych (1919 §8) puts it for pupils as "there can only be a syllable where there is a vowel": тр, жтир are not syllables and not words. There are no syllabic consonants in the standard (historical syllabic r, l became ри, ли or ер, ол: блищати 'to shine', Pravopys 1928 §12) and no vowel-letter diphthongs; the non-syllabic [j] and [u̯] belong to the vowel before them (2. Vowels §6).

1.2 Open syllables dominate

Ukrainian prefers open syllables. The first 100 000 sentences of the Leipzig ukr_news_2024 collection (1 283 717 word tokens; count of 2026-11-06, syllables = vowel letters) give:

72.6% of word tokens end in a vowel letter, that is, in an open syllable. This is the measurable side of the "euphony" of the tradition: Bas-Kononenko (2019) observes that the consonant-to-vowel ratio of the inventory (32 : 6) comes close to 1 : 1 in speech because open syllables prevail, and the euphonic alternations of 4. Connected speech (у/в, і/й, з/із/зі) work to keep it so across word boundaries.

1.3 Clusters

Clusters of three or four consonants occur at the beginning of words, mostly where a prefix or the preposition в meets a root: вздовж 'along', встромити 'to thrust in', вчора, ткнути 'to poke'. Final clusters are mostly the result of lost weak vowels (текст, міст, смерть) or of loans (контраст, концерт). Many clusters are simplified in pronunciation and spelling (4. Connected speech §7).

1.4 Syllable division in writing

The orthography divides words at line breaks by syllables (гай-ка, зо-шит, книж-ка, ко-ло-дязь, Хар-ків), with rules that follow the phonology (Pravopys 2019 §63):

• a single vowel letter may not be left at the end of a line or carried over alone (ака-демія, not а-кадемія; або, моя, око are not divided);
• дж, дз are not split where they are one sound (ґу-дзик, хо-джу) and are split where a prefix ends in д (над-звичайний, під-живляти);
• йо, ьо are not split (па-йок, сльо-за); an apostrophe, ь and й stay with the preceding letter (бур'-ян, кіль-це, бай-ка);
• elsewhere a cluster may be divided at any point: Дні-про and Дніп-ро, се-стра and сест-ра, видавни-цтво, видавниц-тво, видавницт-во.

The last rule is a statement that the syllable boundary inside a cluster is not fixed in Ukrainian; it matches the free choice speakers show.

2. What stress is

Ukrainian stress is dynamic: the stressed syllable is louder and longer, with a pitch movement in the phrase. It is not tonal and has no phonemic length. Because unstressed vowels are reduced only weakly (2. Vowels §2), the difference between stressed and unstressed syllables is smaller than in Russian or English, and long words often have a secondary stress (§7.1) that keeps the rhythm even (Bas-Kononenko 2019).

Free. The stress can fall on any syllable. In the Ukrainian Wiktionary, among headwords of two or more syllables whose syllable template carries exactly one stress mark (2026-09-01 dump, counted 2026-11-06), the stressed syllable is, counted from the end of the word:

The figures describe a dictionary sample, not running text, and the sample leans to short native nouns. They show what the grammars say: no position is excluded, the penultimate is the commonest, a final stress is ordinary in nouns (вода́, село́, кобза́р, життя́) and rare in infinitives (whose ending -ти is almost never stressed: писа́ти, ходи́ти, ви́писати), and adjectives are mostly stressed on the syllable before the ending (зеле́ний, вели́кий) or on the ending itself (нови́й, молоди́й, дороги́й).

Not written. Ordinary text has no stress marks. Dictionaries, schoolbooks, the orthography and children's books mark the stress with an acute accent over the vowel (ру́ки, замо́к); the character is the combining acute U+0301, or a precomposed accented vowel, depending on the typesetting (5. The writing system). A writer may mark the stress to resolve a homograph in context (Він купив замо́к).

3. Minimal pairs

3.1 Lexical

Pairs of different words told apart by stress alone:

The last four pairs are Smal-Stockyj's (1913 §5), who calls them words that "differ quite by chance only in the place of the stress", with пра́вило / прави́ло as his example of one word with two meanings.

3.2 Grammatical

Pairs of forms of one word told apart by stress alone:

The aspect pairs rest on a regular fact: a perfective verb with the prefix ви- always stresses the prefix (ви́писати, ви́брати, ви́йти), and its imperfective partner does not (випи́сувати, вибира́ти, вихо́дити). Smal-Stockyj (1913 §15) states it in the description of verb aspect: the suffix -ува- of secondary imperfectives is "always unstressed", and "the stressed prefix ви- of perfective verbs loses the stress" in them. 13. Verbs has the aspect system.

The gender and number forms of short adjectives and of past-tense verbs can also differ by stress (ма́ла 'had' vs мала́ 'small' above; була́, було́, були́ against був: the past of бу́ти stresses the ending in the feminine, neuter and plural).

4. Stress in the paradigm

4.1 The accent types

Most words keep the stress on one syllable throughout the paradigm; a large minority stress the ending; a small set move the stress between stem and ending by number or case. The Ukrainian Wiktionary codes each noun with a stress type in Zaliznyak's scheme (letters a–f, with primes for exceptions in single forms; docs/data.md). Over the noun entries that carry a type (2026-09-01 dump, counted 2026-11-06; primed types counted with their letter):

16 482 entries carry a type; another 11 160 noun entries carry none, so the shares are of the coded part. The mobile types c–f are a small share of the dictionary (3.8%) but include many of the most frequent words: рука, нога, голова, вода, зима, гора, сестра, село. Smal-Stockyj (1913 §§17–25) sorts the masculine and feminine nouns into the same groups by hand: nouns that stress the endings in the plural (образ, рот, син, дуб, хліб, Бог, плуг, віз: type c), nouns that keep stem stress only in the nominative and vocative singular and stress the ending elsewhere (когут 'rooster', хрест, віл — вола́, кіт — кота́, осел — осла́), and the feminine голова́, вода́, зима́, весна́, борода́, сторона́, череда́ with stem stress in the accusative singular and nominative plural.

The sharpest single-case effect is the accusative singular of feminine nouns of type f′ and d′: рука́ — ру́ку, нога́ — но́гу, вода́ — во́ду, зима́ — зи́му, голова́ — го́лову, гора́ — го́ру, стіна́ — сті́ну. In fixed phrases the stress may then jump onto a preposition (§7.3).

4.2 Verbs

The present tense of many verbs stresses the ending in the first person singular and the stem elsewhere:

The past tense stresses the stem or the ending by verb (чита́в, чита́ла; ніс, несла́, несли́; був, була́, були́). The imperative follows the first person singular (пиши́, ходи́, носи́). The adverbial participle in -чи follows the third person plural with a shift (пи́шучи, хо́дячи, несучи́). These patterns are lexical: Smal-Stockyj (1913 §§38–41) gives them verb class by verb class.

4.3 Adjectives and the rest

Adjectives keep a fixed stress in all their forms (зеле́ний, зеле́ного, зеле́ним; нови́й, ново́го, нови́м); comparatives move it (до́вгий — до́вший, дороги́й — доро́жчий; Pravopys 2019 §20 gives the stress with the consonant change). Numerals move it in their case forms (оди́н — одного́, два — двох, сім — семи́, сімо́х). Pronouns: мене́, тебе́, його́, її́, нас, вас, with stress on the last syllable.

5. Variant stresses

The norm admits a number of words with two correct stresses. In the Ukrainian Wiktionary, 793 of 18 691 multi-syllable headwords with a stress-marked syllable template carry two stress marks (4.2%; counted 2026-11-06; a minority of these are compounds with a stress on each part). Examples from the list:

Some pairs are true free variants (по́милка / поми́лка, за́вжди / завжди́), some differ by region or style, and some by meaning (пра́вий 'right-hand' / прави́й 'righteous' in older usage). The orthoepic dictionaries differ among themselves on how many variants they admit and how they rank them; Bas-Kononenko (2019) lists the "variability of the norm" as one of the points on which the three dictionaries she compares disagree, and argues for a new orthoepic dictionary after the 2019 orthography.

6. The norm and usage

The codified stress of a number of frequent words differs from what many speakers say, mostly under the influence of Russian, where the cognate has another stress. School orthoepy singles out the same words again and again:

The codified forms in the first column are those of the Ukrainian Wiktionary syllable templates where it has them (катало́г, завда́ння, о́лень, листопа́д, докуме́нт) and of the standard orthoepic dictionaries. The deviations are recorded here from the orthoepic literature, not measured: there is no open stress-annotated corpus of spontaneous speech in Mova's collection to count them in. The question of whether usage is moving the norm for any of these words is open; for the variants of §5 it already has.

7. Compounds, loans and clitic groups

7.1 Compounds and secondary stress

Compounds have one main stress, usually on the second element, and long compounds often a secondary stress on the first: во̀допостача́ння 'water supply', сі̀льськогоспода́рський 'agricultural'. Some compounds keep two equal stresses (the double-marked compounds of §5). Bas-Kononenko (2019) counts secondary stress among the features of the smooth Ukrainian rhythm.

7.2 Loans and names

Loans usually keep the stress of their source or of the language they came through: бюро́, кафе́, журі́, ра́діо, таксі́; Ло́ндон, Пари́ж, Ве́рді. Where Russian mediation gave a stress that differs from the source, the 2019 orthography marks the stress it prefers on every name it lists (Ге́те, Гарсі́я, Чика́го, Гео́рг; §122) but does not decide stress as such; stress belongs to the orthoepic dictionaries.

7.3 Clitic groups

Prepositions and the particle не are proclitics, unstressed, but in a closed set of fixed phrases the stress moves onto the preposition from a noun of a mobile type: на́ ніч 'for the night', за́ руку 'by the hand'. The reflexive -ся never takes the stress (сміє́ться, умива́ється). The enclitic particles же/ж, би/б, то are unstressed (4. Connected speech §5).

8. Stress in language technology

Because stress is not written, a text-to-speech or pronunciation system has to predict it, and Ukrainian makes this hard: the stress depends on the word (за́мок / замо́к), the form (ру́ки / руки́), and sometimes admits two correct answers. Senyk et al. (2025) built the open Ukrainian Lexical Stress Benchmark for this: 1 026 sentences with 6 439 unique word forms, stress-marked by a native speaker (300 sentences from Wikipedia, 438 from the GRAC corpus, and 288 added sentences that put the other stress variant of an ambiguous word in context). Their best system, a byte-level ByT5 model trained on about 135 000 automatically stress-marked sentences of Voice of America speech and combined with a dictionary, places the stress correctly in 92.5% of words but in only 52.0% of whole sentences; an older dictionary tool (Ukrainian Accentor) reaches 73.2% of words and 16.6% of sentences on the same benchmark. A sentence of fifteen words with one error is a failed sentence, which is what a listener hears.

Stress is also absent from the treebanks: neither UD Ukrainian-IU nor UD Ukrainian-ParlaMint (2.18) marks it, and VESUM lists forms without stress. The open sources with stress are dictionaries (the Ukrainian Wiktionary, CC BY-SA, learning and tests only) and the stress-marked examples of the 2019 orthography (an official text, not protected).

9. Rhythm and intonation in outline

Rhythm. Weak vowel reduction and secondary stress give Ukrainian a more even rhythm than Russian; unstressed syllables are not compressed as in English. Verse uses the syllabo-tonic metres (iamb, trochee, amphibrach …) of the European tradition alongside the older syllabic metres of the folk song (the коломийка line of 14 syllables, 4 + 4 + 6) (37. Register and variation on songs).

Intonation. In outline:

• Statements fall at the end: Він прийшов. \
• Yes/no questions need no particle or word order change: the pitch rises sharply on the word in question and falls after it. Він прийшо́в? (rise on прийшов: 'Has he come?'); Він прийшов? with the rise on він: 'Is it he who has come?'. The particle чи at the start (Чи він прийшов?) marks the question in writing and in more formal speech; with чи the rise is smaller.
• Wh-questions have the high pitch on the question word and a fall: Хто прийшо́в?
• Enumerations rise on each member but the last; exclamations and address (vocative) have a high or rising-falling peak on the stressed syllable of the key word (Ма́мо!).

These are the descriptions of the school tradition. Mova's collection holds no open, measured study of Ukrainian intonation; the statements above are given without counts, and the chapter on questions (26. Questions) treats the syntax.

10. How Mova handles syllables and stress

Mova has no model of Ukrainian stress or syllables.

• Stress marks are removed, not used. kg/src/morph.rs defines invisible, which counts the combining acute U+0301 and grave U+0300 among invisible characters, and norm, which drops them before lookup. A stress-marked text (Він купив замо́к) is therefore read as the unmarked one, and the information is lost; the stress cannot be restored afterwards because VESUM has none.
• Homographs distinguished by stress are one string. замок is one form with two lemmas (за́мок, замо́к) if VESUM lists both; kg keeps all analyses and rejects the sentence when the ambiguity matters to the parse, without guessing (kg — the Mova knowledge graph). руки (nom. pl. or gen. sg.) is resolved, where it is, by case agreement and government, not by stress.
• No syllabifier, no hyphenation. Nothing in Mova divides Ukrainian words into syllables or applies the line-division rules of §1.4.
• No intonation. Mova reads text; question status comes from the question mark and the particle чи. The kg parser rejects questions outright (kg — the Mova knowledge graph, "Rejections").

What would be needed. A stress lexicon from an open source with stress (Wiktionary is CC BY-SA, so for learning and tests only; a release would need permission or another source), the paradigm stress types of §4 to stress inflected forms (a Wiktionary noun entry's type letter is enough to stress all its case forms), and a disambiguation step for homographs in context. Senyk et al. (2025) show the size of the problem: a dictionary plus a strong model still errs in nearly half the sentences, mostly on homographs and unknown words. Their benchmark is open and would be the natural test set. None of this is built.

Sources for this chapter

• Smal-Stockyj, Stephan. 1913. Ruthenische Grammatik. §5 (Tonstelle), §15 (verb aspect and stress), §§17–25 (noun declension and stress groups), §§38–41 (verbs). Public domain. Library books/s/st/stockyj-1913-ruthenische-grammatik (uk-gram-smal-stockyj-1913); archive.org/details/ruthenischegramm00smaluoft
• Simovych, Vasyl'. 1919. Hramatyka ukrajins'koji movy. §§8–10. Public domain. Library books/s/si/simovych-1919-hramatyka-ukrainskoi-movy-dlia (uk-gram-simovych-1919).
• Ukrajins'kyj pravopys (2019). §§20, 63, 122, and the stress marks throughout. Official document. Library books/u/uk/ukrainskyi-pravopys-2019 (uk-gram-pravopys-2019).
• Ukrajins'kyj pravopys (1928). §12. Official document. Library books/u/uk/ukrainskyi-pravopys-1928-r-1928 (uk-gram-pravopys-1928).
• Bas-Kononenko, O. V. 2019. Vymovni normy jak mirylo mylozvučnosti ukrajins'koji movy. Ukrajins'ka mova 2019 (1): 103–114. Library card CC BY 4.0; the article prints CC BY-NC-ND 4.0, so paraphrased only (bas-2019-kononenko-orfoepichni-normy).
• Senyk, Anastasiia, Mykhailo Lukianchuk, Valentyna Robeiko & Yurii Paniv. 2025. Context-Aware Lexical Stress Prediction and Phonemization for Ukrainian TTS Systems. UNLP 2025. CC BY 4.0 (senyk-2025-context-aware-lexical-stress-prediction); aclanthology.org/2025.unlp-1.11
• Counts: Ukrainian Wiktionary dump 2026-09-01 (20260901, CC BY-SA, counted only: syllable templates {{склади|…}} and stress types in {{імен uk …}}); Leipzig ukr_news_2024, CC BY (Goldhahn, Eckart & Quasthoff 2012); counts of 2026-11-06.
• Mova: kg/src/morph.rs (invisible, norm), kg — the Mova knowledge graph; Data, libraries and licences (Wiktionary templates).

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