Having defects; defective, faulty; imperfect. Now rare.

Of or relating to dysfunction; that disrupts or impairs proper, normal, or satisfactory function; not operating normally.

out of whack: disordered, malfunctioning; out of order or alignment. Cf. wacky, adj. Chiefly U.S. figurative.

That malfunctions.

Originally and chiefly Australian. Faulty or broken; (of an action or idea) incorrect, ill-advised, or dubious.