BERSERK

adj. 25B6; adjective MAD, crazy, insane, out of one's mind, hysterical, frenzied, crazed, demented, maniacal, manic, frantic, raving, wild, out of control, amok, on the rampage; informal off one's head, off the deep end, ape, bananas, bonkers, nuts, hyper; Brit. informal spare, crackers, barmy; N. Amer. informal postal.