INVALID

I. adjective see: valid Date: 1542 not valid:, being without foundation or force in fact, truth, or law , logically inconsequent, ~ly adverb II. adjective Etymology: Latin & French; French ~e, from Latin ~us Date: 1642 suffering from disease or disability ; sickly , of, relating to, or suited to one that is sick , III. noun Date: 1701 one who is sickly or disabled, IV. transitive verb Date: 1787 to remove from active duty by reason of sickness or disability, to make sickly or disabled