1. (adj) invalid, shut-in
someone who is incapacitated by a chronic illness or injury
Synonyms: invalid, shut-in
Antonyms: binding, sound, well-grounded, unexpired, reasoned, valid, legal, effectual, legitimate, validated, logical
2. (adj) invalid
having no cogency or legal force
Antonyms: legitimate, logical, valid, validated, binding, sound, legal, reasoned, unexpired, well-grounded, effectual
3. (verb) invalid
no longer valid
Antonyms: logical, well-grounded, unexpired, effectual, sound, reasoned, legal, legitimate, binding, valid, validated
4. (verb) invalid
force to retire, remove from active duty, as of firemen
Synonyms: disable, handicap, incapacitate
Antonyms: validated, effectual, well-grounded, unexpired, legitimate, sound, valid, binding, legal, logical, reasoned
5. (verb) disable, invalid, incapacitate, handicap
injure permanently
Synonyms: incapacitate, handicap, disable, disenable, hamper, invalid, hinder
Antonyms: well-grounded, valid, sound, legitimate, legal, binding, validated, unexpired, reasoned, logical, effectual
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Synonyms for invalid 
