invalid
noun(in-va-lid)
someone who is incapacitated by a chronic illness or injury
Synonyms: shut-in, 
invalid
verb(in-va-lid)
injure permanently
invalid
verb(in-va-lid)
force to retire, remove from active duty, as of firemen
invalid
adjective(in-va-lid)
having no cogency or legal force
Examples:
Invalid reasoning. 
An invalid driver's license. 
invalid
adjective(in-va-lid)
no longer valid
Examples:
The license is invalid.