DERANGED

adj. mad, insane, demented, lunatic, unhinged, unbalanced, berserk, crazy, crazed, psychotic, irrational, non compos mentis, out of one's mind or senses or head, not all there, of unsound mind, crack-brained, mad as a hatter or March hare, off the rails, Colloq touched, dotty, daft, cracked, bats, cuckoo, Brit potty, US have nobody home (upstairs), out to lunch, off-the-wall; Slang bonkers, dippy, barmy or balmy, batty, screwy, loony, nuts, nutty, wacky, bananas, off one's rocker, off one's trolley, mental, missing a few marbles, not having all one's marbles, kooky, with a screw loose, Chiefly Brit off one's chump, Chiefly US (plumb) loco, meshuga Police said that the killer was completely deranged and should be approached with caution