invalid

(noun) someone who is incapacitated by a chronic illness or injury. Synonyms: shut-in.

(verb) force to retire, remove from active duty, as of firemen.

(verb) injure permanently. Synonyms: disable, incapacitate, handicap. Example: "He was disabled in a car accident."

(adj) having no cogency or legal force. Synonyms: invalid (vs. valid). Examples: "Invalid reasoning." "An invalid driver's license."

(adj) no longer valid. Example: "The license is invalid."