Another word for insane
crazy, crazed, mad, wild, raging, frenzied, lunatic, schizophrenic, psychotic, psychopathic, psychoneurotic, paranoid, non compos mentis (Latin), maniacal, raving, demented, rabid, berserk, unbalanced, unhinged, act of one's mind, out of one's head, moonstruck, unsettled, mentally unsound, mentally diseased, sick, suffering from hallucinations, bereft of reason, daft, deluded, possessed, stark mad, having a devil, obsessed, disordered, touched, addlebrained, addlepated, addleheaded, nutty*, loony*, nuts*, schizo*, schizzy*, tetched*, balmy*, screwy*, loco*, off the wall*, wacko*, cuckoo*, bughouse*, crazy as a coot*, mad as a March hare*, gone*, derailed*, half-cocked*, haywire*, bats*, batty*, off the beam*, having bats in the belfry*, round the bend*, bonkers*, unglued*, nutty as a fruitcake*, off one's nut*, off one's rocker*, out of one's gourd*, dotty*, pixilated*, cracked*, having a few buttons missing*, one can short of a six-pack*, frothing at the mouth*, bananas*, not playing with a full deck*, out to lunch*, not all there*, wigged out*, off the deep end*; see also sick, violent 2, 4.
Another word for insaneadjective
Afflicted with or exhibiting irrationality and mental unsoundness:brainsick, crazy, daft, demented, disordered, distraught, dotty, lunatic, mad, maniac, maniacal, mentally ill, moonstruck, off, touched, unbalanced, unsound, wrong. (Informal) bonkers, cracked, daffy, gaga, loony. (Slang) bananas, batty, buggy, cuckoo, fruity, loco, nuts, nutty, screwy, wacky. (Chiefly British) crackers. (Law) non compos mentis. Idioms: around the bend, crazy as a loon, mad as a hatter, not all there, nutty as a fruitcake, off (or out of) one's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See sane
So senseless as to be laughable:absurd, foolish, harebrained, idiotic, imbecilic, lunatic, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany. (Informal) cockeyed, crazy, loony, loopy. (Slang) balmy2, dippy, dopey, jerky, sappy, wacky. See ability, knowledge