suffering from disease or disability She gave up work to look after her invalid motherdesigned for use by disabled people an invalid chair invalidity /-ʹliditi/ noun[from invalid3, influenced by French invalide]
without legal force an invalid passportlogically inconsistent an invalid argument invalidity /-ʹliditi/ nouninvalidly advinvalidness noun[Latin invalidus weak, from in-1 + validus: see valid]
(usu + out) to remove (somebody) from active duty by reason of sickness or disability He was invalided out of the army [from invalid2]