adjective

imperfect or faulty.

complaints over defective goods

faulty,flawed,imperfect,shoddy,inoperative,not working,not functioning,non-functioning,malfunctioning,out of order,unsound,weak,deficient,incomplete,in disrepair,broken,cracked,torn,scratched,deformed,warped,buckled,gone wrong,on the blink,knackered,duff

noun

a person with mental disabilities.