adjective
invalid
in-VAL-id/ɪnˈvælɪd/
Not acceptable under the relevant rules or reasoning.
The mismatched ticket pieces are invalid, so the attendant keeps the gate closed.
Etymology
Literally “not strong,” invalid applies lack of strength to legal force: something invalid has no effective authority. In reasoning, the corresponding failure is lack of logical soundness.
In context
to say that A man gives himself for nothing is to say what is absurd and inconceivable such an act is illegitimate and invalid for the simple reason that he who performs it is not in his right mind
More examples
- The coupon is invalid after its expiration date.
- Her argument is invalid because the conclusion does not follow from the premises.
- The website rejects invalid email addresses.
Forms
invalid
invalidate verb — To make or declare something invalid.
invalidity noun — The condition of not being valid.
Similar words
- void
- Specifically describes something with no legal force or effect.
- unsound
- Emphasizes flawed reasoning or unreliable foundations rather than rule violations.
- unacceptable
- Can reflect personal standards rather than formal rules or logic.