mad

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Related to as mad as a hatter: as dead as a doornail

mad

(Absurd), adjective absent-minded, anserine, apish, asinine, beguiled, bemused, besotted, brainless, buffoonish, careless, childish, clueless, confused, crackbrained, crazy, credulous, daft, dangerous, dazed, derisible, dizzy, doting, dull-witted, dumb, excessive, extravagant, fatuitous, fatuous, fond, fool, fool headed, foolish, for the birds, fuddled, futile, gaga, giddy, groundless, harebrained, harum-scarum, idiotic, ill-advised, ill-considered, illogical, imbecile, imbecilic, immature, impractical, improper, imprudent, inane, inappropriate, incoherent, incongruous, inconsistent, indiscreet, inept, infatuated, injudicious, insensate, irrational, irresponsible, laughable, light-minded, ludicrous, maudlin, moronic, muddled, nonsensical, perilous, pointless, preposterous, puerile, rambling, rash, reckless, ridiculous, risible, scatterbrained, senseless, sentimental, short-sighted, silly, simple-minded, spastic, stupid, thoughtless, unreasonable, unsafe, unsensible, unsound, unwise, wandering, wet, wild-eyed, witless

mad

(Insane), adjective bereft of reason, deluded, deprived of reason, deranged, idiosyncratic, irrational, lunatic, manic, mentally deficient, non commos mentos, not of a sound mind, reasonless, senseless, unbalanced, unsound

mad

(Irritated), adjective abandoned, amok, angry, annoyed, at the end of one's rope, bellowing, berserk, beeide oneself, blue in the face, carried away, chafed, demoniacal, demonic, displeased, distracted, drive one mad, ecstatic, enrage, enraged, enraptured, fed up, feral, ferocious, fierce, fiery, flaming, flared up, flaring, flushed with anger, frantic, frenzied, frenzy, frothing at the mouth, fulminating, fuming, furious, galled, haggard, howling, hysterical, in a huff, in a transport or ecstasy, in high dudgeon, in hysterics, incensed, indignant, inflamed, infuriate, infuriated, intoxicated, irate, ireful, lash into fury, madden, madding, make one's blood boil, maniac, nettled, orgasmic, orgiastic, out of one's wits, peeved, piqued, possessed, rabid, raging, ranting, raving, ravished, ready to burst, red-hot, riled, roaring, running mad, storming, transported, uncontrollable, up in arms, vexed, violent, white-hot, wild, wild-eyed, work up into a passion, wrathful, wroth
See also: deranged, lunatic, non compos mentis, outrageous, quixotic