invalid (
http://definr.com/invalid)
adj 1: having no cogency or legal force; "invalid reasoning"; "an
invalid driver's license" [ant:
valid]
2: no longer valid; "the license is invalid"
n : someone who is incapacitated by a chronic illness or injury
[syn:
shut-in]
v 1: force to retire, remove from active duty, as of firemen
2: injure permanently; "He was disabled in a car accident"
[syn:
disable,
incapacitate,
handicap]