1. Having no cogency or legal force
   "invalid reasoning"; "an invalid driver's licence"
    
2. No longer valid
   "the licence is invalid"

1. Someone who is incapacitated by a chronic illness or injury
   "Volunteers delivered meals to invalids in the community";
   - shut-in

1. Force to retire, remove from active duty, as of firemen
   "The department invalided several firefighters after they were injured in the line of duty"
    
2. Injure permanently
   "The fall invalided him for life";
   - disable, incapacitate, handicap

Derived forms: invalids, invaliding, invalided

See also: bad, expired, fallacious, false, illegitimate, invalidated, null, null and void, nullified, sophistic, sophistical, spurious, uncollectible, unsound, void

Type of: diseased person, injure, remove, sick person, sufferer, wound

Antonym: valid

Part of: homebound

Encyclopedia: Invalid