Invalid — Defs

01 a. Of no force, weight, or cogency; not valid; weak.

1.
Of no force, weight, or cogency; not valid; weak.
2.
Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.(Law)

02 n. A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health who is unable to care for himself.

1.
A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health who is unable to care for himself.

03 a. Not well; feeble; infirm; sickly; as, he had an invalid daughter.

1.
Not well; feeble; infirm; sickly; as, he had an invalid daughter.

04 v. t. To make or render invalid or infirm.

1.
To make or render invalid or infirm.
2.
To classify or enroll as an invalid.
“Peace coming, he was invalided on half pay.” — Carlyle.