invalid
part of speech
adjective (invalid — said in-VAL-id); noun (an invalid, invalids — said IN-va-lid)
meaning for a pupil
1) (adjective) Not legally or officially acceptable, as in an invalid ticket. tree →
2) (adjective) Not correct or not based on good reasons, as in an invalid argument or invalid input. tree →
3) (noun, old and can be offensive) A person who is ill or disabled for a long time and needs care. tree →
sense in the lessons
In everyday life: invalid tickets, passwords or passports are not accepted. In maths and computing: «invalid input» means the computer cannot use what you typed; an invalid answer does not fit the rules. In old stories: an invalid lies in bed. Today «invalid» for a person is considered old-fashioned or hurtful.
examples
- This ticket is invalid — it's for yesterday's show. tree →
- The password is invalid, try again. tree →
- Your argument is invalid because you skipped a step. tree →
- A cheque without a signature is invalid. tree →
- Her passport was invalid, so she couldn't fly. tree →
- In the old story, the invalid was cared for by his sister. tree →
- It was warranted harmless to infants and invalids, so he felt quite safe. tree →
note
Two words with different stress: in-VAL-id (not valid) and IN-va-lid (a sick person). Opposite: valid. Verb: invalidate. Use «disabled person» or «person who is ill», not «an invalid».
Trees and pragmatics
Every meaning and example of «invalid» parsed by Mova, each sentence with its dependency tree and frames.