invalid invalid /ˈɪnvəlɪd, ˌɪnˈvæləd/

adjective

1. No longer valid  ( invalid )
   no longer valid
    The license is invalid
   the license is invalid
   
2. Having no cogency or legal force  ( invalid )
   having no cogency or legal force
    Invalid reasoning
   invalid reasoning
    An invalid driver's license
   an invalid driver's license
   

noun

1. () Someone who is incapacitated by a chronic illness or injury  ( shut-in , invalid )
   someone who is incapacitated by a chronic illness or injury
   

verb

1. Injure permanently  ( disable , incapacitate , invalid , handicap )
   injure permanently
    He was disabled in a car accident
   He was disabled in a car accident
   
2. Force to retire, remove from active duty, as of firemen  ( invalid )
   force to retire, remove from active duty, as of firemen