Synonyms and related words :
abnormal, absurd, apish, asinine, at fever pitch, batty, bedlamite, befooled, beguiled, bereft of reason, besotted, bonkers, brainless, brainsick, buffoonish, buggy, bughouse, bugs, certifiable, cockeyed, crackbrained, cracked, crackers, cranky, crazed, crazy, credulous, cuckoo, daffy, daft, dazed, delirious, deluded, demented, deprived of reason, deranged, disordered, disoriented, distraught, dizzy, doting, dotty, dull, dumb, eccentric, fanatical, fatuitous, fatuous, febrile, feverish, flaky, flighty, fond, fool, foolheaded, foolish, frantic, frenetic, frenzied, fruity, fuddled, furious, futile, gaga, goofy, gulled, hallucinated, hectic, hysteric, idiotic, imbecile, imbecilic, inane, inept, infatuated, irrational, irresponsible, kinky, kooky, loco, loony, loopy, ludicrous, lunatic, mad, maddened, maniac, maniacal, manic, maudlin, mazed, mental, mentally deficient, meshuggah, mindless, moon-struck, moronic, neurotic, non compos, non compos mentis, nonsensical, not all there, not right, nuts, nutty, odd, of unsound mind, off, out of it, overanxious, overdesirous, overeager, overenthusiastic, overzealous, perfervid, potty, psycho, psychoneurotic, psychotic, queer, quirky, reasonless, reckless, ridiculous, round the bend, sappy, scatterbrained, schizo, schizoid, schizophrenic, screwy, senseless, sentimental, sick, silly, spaced out, spacy, stark-mad, stark-staring mad, strange, stupid, tetched, thoughtless, touched, ultrazealous, unbalanced, unhinged, unrealistic, unsane, unsettled, unsound, wacky, wandering, wet, wild, witless