Similar word to mad:

aberrant, absurd, bananas, batty, crazed, cuckoo, daft, delirious, demented, deranged, distracted, fantastic, foolhardy, foolish, frantic, frenetic, frenzied, illogical, imprudent, invalid, irrational, kooky, loony, ludicrous, lunatic, mental, non compos mentis, nonsensical, nutty, of unsound mind, off one's rocker, out of one's mind, preposterous, psychotic, rabid, raving, senseless, unbalanced, unhinged, unreasonable, unsafe, unsound, unstable, wacky