Noun

• S: (n) invalid, shut-in (someone who is incapacitated by a chronic illness or injury)

Verb

• S: (v) invalid (force to retire, remove from active duty, as of firemen)
• S: (v) disable, invalid, incapacitate, handicap (injure permanently) "He was disabled in a car accident"

Adjective

• S: (adj) invalid (having no cogency or legal force) "invalid reasoning"; "an invalid driver's license"
• S: (adj) invalid (no longer valid) "the license is invalid"
• similar to
• antonym