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Invalid

Definition: Of no force, weight, or cogency; not valid; weak.

Invalid

Definition: Having no force, effect, or efficacy; void; null; as, an
invalid contract or agreement.

Invalid

Definition: A person who is weak and infirm; one who is disabled for
active service; especially, one in chronic ill health.

Invalid

Definition: Not well; feeble; infirm; sickly; as, he had an invalid
daughter.

Invalid

Definition: To make or render invalid or infirm.

Invalid

Definition: To classify or enroll as an invalid.