adj. 25B6; adjective
a faulty electric blanket : MALFUNCTIONING, broken, damaged, defective, not working, out of order; informal on the blink, acting up, kaput, bust; Brit. informal knackered, playing up, duff; N. Amer. informal on the fritz.
her logic is faulty : DEFECTIVE, flawed, unsound, inaccurate, incorrect, erroneous, fallacious, wrong.
dys-.
working, sound.