Invalid(a.)
- Of no force, weight, or cogency; not valid; weak.
Invalid(a.)
- Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.
Invalid(a.)
- A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.
Invalid(n.)
- Not well; feeble; infirm; sickly; as, he had an invalid daughter.
Invalid(v. t.)
- To make or render invalid or infirm.
Invalid(v. t.)
- To classify or enroll as an invalid.
Invalidate(v. t.)
- To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument.