"invalid" in the noun sense
1. invalid, shut-in
someone who is incapacitated by a chronic illness or injury
"invalid" in the verb sense
force to retire, remove from active duty, as of firemen
2. disable, invalid, incapacitate, handicap
"He was disabled in a car accident"
"invalid" in the adjective sense
having no cogency or legal force
"an invalid driver's license"
no longer valid
"the license is invalid"
Source: WordNet® (An amazing lexical database of English)
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