faulty

US /ˈfɑːl.t̬i/

UK /ˈfɑːl.t̬i/

1.

working badly or unreliably because of imperfections.

:

•

a car with faulty brakes

:

malfunctioning broken damaged defective out of order out of commission inoperative unsound unusable useless on the blink on its last legs kaput bust busted done for wonky dud knackered duff on the fritz

:

working functioning