Synonyms for Mad:

adj.

all (adjective)
huffy, sore.
angry (adjective)
angry, berserk, displeased, distraught, enraged, exasperated, excited, furious, incensed, indignant, irate, irritated, pissed off, raging, wild.
crazed (adjective)
berserk.
crazy, insane (adjective)
absurd, batty, cuckoo, daft, delirious, demented, deranged, distracted, foolish, frantic, frenzied, irrational, kooky, loony, ludicrous, lunatic, non compos mentis, nonsensical, nutty, preposterous, psychotic, rabid, unbalanced, unhinged, unsound, wacky, bananas.
deranged (adjective)
nutty.
enthusiastic; in love (adjective)
ardent, crazy, keen, nuts, zealous.
foolish (adjective)
ill-considered, zany, imbecilic, loopy, tomfool, dippy.
insane (adjective)
babbling, batty, berserk, blithering, crazy, delirious, demented, deranged, feverish, frenzied, hysterical, insane, irrational, kooky, lunatic, maniacal, neurotic, nutty, psycho, psychotic, schizoid, unbalanced, Crack-brained, brain-sick, brainsick, crackers, fruity, loco, moonstruck, bananas.
lunatic (adjective)
Fiendish, crackpot, crazy, kooky, lunatic, neurotic, nutty, psychotic.
screwy (adjective)
screwy.
uncontrolled (adjective)
frenzied.
violent (adjective)
rabid.

n.

childish, laughable, ludicrous, over-the-top, ridiculous, not in your right mind/not right in the head. annoyed, belligerent, cross, put out, rabid, raging. choleric, empty-headed, feelings, simple-minded, slow, slow-witted, thick, unintelligent. bonkers, buggy, cracked, crackers, cuckoo, daft, disordered, distraught, fruity, hasty, ill-considered, impetuous, impulsive, irresponsible, loco, loony, maniac, mentally ill, mindless, moonstruck, non compos mentis, nuts, off, sane, screwy, shallow, touched, undiscriminating, unsound, unthinking, wacky, wrong, Daffy, bananas. ability, absurd, balmy, cockeyed, dopey, idiotic, imbecilic, jerky, knowledge, loopy, moronic, nonsensical, preposterous, sappy, silly, tomfool, unearthly, zany, dippy. ardent, concern, enthusiastic, fervent, gung ho, keen, warm, zealous. calm, Madding. mad (noun)
angry, brainsick, crazy, delirious, demented, distracted, disturbed, excited, foolish, frantic, harebrained, huffy, insane, sick, sore, unbalanced, unhinged, unrestrained, wild.
mentally ill (noun)
bipolar, confused, depressed, diminished responsibility.

Other synonyms:

annoyed, bonkers, crackers, fruity, gung ho, jerky, laughable, loco, loony, loopy, ludicrous, mentally ill, over-the-top, ridiculous, wacky, Madding, Daffy, bananas, dippy. belligerent, buggy, cockeyed, cracked, daft, distraught, imbecilic, moronic, non compos mentis, nonsensical, nuts, preposterous, put out, screwy, warm, zealous. ardent, childish, choleric, disordered, dopey, fervent, idiotic, moonstruck, sappy, silly, touched, unsound, zany. enthusiastic, keen, unearthly. wrong. off. mentally ill
bipolar, confused, depressed, diminished responsibility.
preposterous
absurd.
Other relevant words:
ability, absurd, annoyed, ardent, balmy, belligerent, bipolar, bonkers, brainsick, buggy, childish, choleric, cockeyed, concern, confused, cracked, crackers, cross, cuckoo, daft, depressed, disordered, distracted, distraught, disturbed, dopey, empty-headed, enthusiastic, excited, feelings, fervent, foolish, frantic, fruity, harebrained, hasty, huffy, idiotic, ill-considered, imbecilic, impetuous, impulsive, irresponsible, jerky, keen, knowledge, laughable, loco, loony, loopy, ludicrous, maniac, mentally ill, mindless, moonstruck, moronic, non compos mentis, nonsensical, nuts, off, over-the-top, preposterous, rabid, raging, ridiculous, sane, sappy, screwy, shallow, sick, silly, simple-minded, slow, slow-witted, sore, thick, tomfool, touched, undiscriminating, unearthly, unhinged, unintelligent, unrestrained, unsound, unthinking, wacky, warm, wild, wrong, zany, zealous, Madding, Daffy, bananas, dippy.

Usage examples for mad

  1. " I asked you if you had gone mad – Only One Love, or Who Was the Heir by Charles Garvice
  2. " I guess we ought to be mad – The Egyptian Cat Mystery by Harold Leland Goodwin
  3. I must forget, or I shall go mad myself!... – The Heart of Una Sackville by Mrs. George de Horne Vaizey