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# invalid

adjective (invalid — said in-VAL-id); noun (an invalid, invalids — said IN-va-lid)

«invalid» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. (adjective) Not legally or officially acceptable, as in an invalid ticket. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#m1)
2. (adjective) Not correct or not based on good reasons, as in an invalid argument or invalid input. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#m2)
3. (noun, old and can be offensive) A person who is ill or disabled for a long time and needs care. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#m3)

### 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 →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#x1)
- The password is invalid, try again. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#x2)
- Your argument is invalid because you skipped a step. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#x3)
- A cheque without a signature is invalid. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#x4)
- Her passport was invalid, so she couldn't fly. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#x5)
- In the old story, the invalid was cared for by his sister. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#x6)
- It was warranted harmless to infants and invalids, so he felt quite safe. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/#x7)

### 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».

## On Mova

- [Trees and pragmatics of «invalid» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invalid/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«invalid» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/invalid.html) on Mova free.