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)
• direct hypernym / inherited hypernym / sister term
• sentence frame
• S: (v) disable, invalid, incapacitate, handicap (injure permanently) "He was disabled in a car accident"
• direct troponym / full troponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• sentence frame

Adjective

• S: (adj) invalid (having no cogency or legal force) "invalid reasoning"; "an invalid driver's license"
• see also
• S: (adj) illegitimate (of marriages and offspring; not recognized as lawful)
• see also
• S: (adj) illegal (prohibited by law or by official or accepted rules) "an illegal chess move"
• S: (adj) invalid (having no cogency or legal force) "invalid reasoning"; "an invalid driver's license"
• S: (adj) unauthorized, unauthorised (not endowed with authority)
• similar to
• antonym
• W: (adj) legitimate [Opposed to: illegitimate] (of marriages and offspring; recognized as lawful)
• similar to
• antonym
• derivationally related form
• S: (adj) invalid (no longer valid) "the license is invalid"