adj., mad·der, mad·dest.

1. Angry; resentful. See synonyms at angry.
2. Suffering from a disorder of the mind; insane.
3. Temporarily or apparently deranged by violent sensations, emotions, or ideas: mad with jealousy.
4. Lacking restraint or reason; foolish: I was mad to have hired her in the first place.
5. Feeling or showing strong liking or enthusiasm: mad about sports.
6. Marked by extreme excitement, confusion, or agitation; frantic: a mad scramble for the bus.
7. Boisterously gay; hilarious: had a mad time.
8. Affected by rabies; rabid.

tr. & intr.v., mad·ded, mad·ding, mads.

To make or become mad; madden.

idioms:

like mad Informal.

1. Wildly; impetuously: drove like mad.
2. To an intense degree or great extent: worked like mad; snowing like mad.

mad as a hatter

1. Crazy; deranged.

[Middle English, from Old English gemǣdde, past participle of *gemǣdan, to madden, from gemād, insane.]

maddish mad'dish adj.

adjective

1. Feeling or showing anger: angry, choleric, indignant. Informal sore. Idioms: hot under the collar. See feelings.
2. Afflicted with or exhibiting irrationality and mental unsoundness: brainsick, crazy, daft, demented, disordered, distraught, dotty, insane, lunatic, 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, offout ofone's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See sane/insane.
3. So senseless as to be laughable: absurd, foolish, harebrained, idiotic, imbecilic, insane, lunatic, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany. Informal cockeyed, crazy, loony, loopy. Slang balmy², dippy, dopey, jerky, sappy, wacky. See ability/inability, knowledge/ignorance.
4. Showing or having enthusiasm: ardent, enthusiastic, fervent, keen¹, rabid, warm, zealous. Informal crazy. Slang gung ho, nuts. See concern/unconcern.
5. Marked by extreme excitement, confusion, or agitation: delirious, frantic, frenetic, frenzied, wild. Archaic madding. See calm/agitation.

Idioms beginning with mad:
mad about
mad as a hatter
mad as a hornet
made
made for each other
made of money
mad rush

See also crazy (mad) about; drive someone crazy (mad); hopping mad; like crazy (mad); stark raving mad.

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adj

Definition: crazy, insane
Antonyms: balanced, ok, rational, reasonable, sane, sound

adj

Definition: enthusiastic; in love
Antonyms: disenchanted, indifferent, unenthusiastic

adj

Definition: very angry
Antonyms: calm, cheered, collected, happy, unruffled

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A cynical view of the world by Ambrose Bierce

adj.

Affected with a high degree of intellectual independence; not conforming to standards of thought, speech and action derived by the conformants from study of themselves; at odds with the majority; in short, unusual. It is noteworthy that persons are pronounced mad by officials destitute of evidence that themselves are sane. For illustration, this present (and illustrious) lexicographer is no firmer in the faith of his own sanity than is any inmate of any madhouse in the land; yet for aught he knows to the contrary, instead of the lofty occupation that seems to him to be engaging his powers he may really be beating his hands against the window bars of an asylum and declaring himself Noah Webster, to the innocent delight of many thoughtless spectators.

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IN BRIEF: adj. - Roused to anger; Affected with insanity.

In a mad world, only the mad are sane. — Akiro Kurosawa

Dansk (Danish)
adj. - gal, forrykt, vanvittig, skør, rasende, ophidset
v. tr. - gøre gal i hovedet, gøre rasende
v. intr. - være vanvittig, opføre sig som en gal

idioms:

• be mad about    være tosset med, være skør med
• drive mad    drive en til vanvid
• go mad    blive vanvittig
• like mad    som en sindssyg
• mad as a hatter    skingrende skør, rablende gal
• mad cow disease    kogalskab, BSE
• mad keen    ivrig, stærkt opsat

Nederlands (Dutch)
gek, boos, dol, hondsdol, zeer grappig, wild, gek/ dol/boos zijn/maken, razernij

Français (French)
adj. - fou, (fig) à l'extrême, insensé, très en colère, furieux, fou de, infernal, pressé
v. tr. - (US) rendre/devenir fou (arch), agir/faire réagir (qn) de façon insensée
v. intr. - (US) rendre/devenir fou (arch), agir de façon insensée

idioms:

• drive mad    rendre fou
• go mad    devenir fou
• like mad    comme un fou
• mad about    être fou de, être passionné de
• mad as a hatter    fou à lier
• mad cow disease    maladie de la vache folle
• mad keen    fou ou emballé de (qch)

Deutsch (German)
adj. - wahnsinnig, tollwütig, böse, ausgelassen, verrückt
v. - toben, verrückt machen

idioms:

• drive mad    verrückt machen
• go mad    verrückt werden
• like mad    wie verrückt
• mad about    verrückt nach, versessen auf
• mad as a hatter    völlig verrückt
• mad cow disease    Rinderwahnsinn
• mad keen    ganz scharf

Ελληνική (Greek)
adj. - τρελός, λυσσασμένος, ξετρελαμένος, έξαλλος
v. - εξαγριώνομαι

idioms:

• be mad about    είμαι τρελός για, μανιακός με
• drive mad    βουρλίζω, κάνω έξω φρενών
• go mad    τρελαίνομαι
• like mad    σαν τρελός
• mad as a hatter    θεόμουρλος
• mad cow disease    νόσος των τρελών αγελάδων
• mad keen    ξετρελαμένος

Italiano (Italian)
pazzo, arrabbiato, matto

idioms:

• be mad about    andare pazzo per
• drive mad    mandare in bestia
• go mad    impazzire
• like mad    come un pazzo
• mad as a hatter    matto da legare
• mad cow disease    sindrome della mucca pazza
• mad keen    entusiasta

Português (Portuguese)
adj. - louco, bobo, hidrófobo
v. - enlouquecer

idioms:

• be mad about    ser louco por
• drive mad    enlouquecer a
• go mad    enlouquecer
• like mad    furiosamente, muito rapidamente
• mad as a hatter    doido de atar
• mad cow disease    doença da vaca louca
• mad keen    muito interessado

Русский (Russian)
сумасшедший, страстно любящий что-либо, неистовый, рассерженный

idioms:

• be mad about    сходить с ума по
• drive mad    сводить с ума
• go mad    сходить с ума
• like mad    как безумный
• mad as a hatter    спятивший
• mad cow disease    болезнь бешеной коровы
• mad keen    жаждать чего-л.

Español (Spanish)
adj. - loco, frenético, insano, furioso, demente, delirante, insensato, chiflado
v. tr. - enloquecer, exasperar
v. intr. - estar o volverse loco

idioms:

• drive mad    enloquecer, volverle loco a uno
• go mad    enloquecer, volverse loco
• like mad    como un loco
• mad about    estar loco por, ser fanático de
• mad as a hatter    más loco que una cabra, loco de atar o de remate
• mad cow disease    enfermedad de las vacas locas
• mad keen    estar loco por hacer algo

Svenska (Swedish)
adj. - vansinnig, arg, vild
v. - vara farlig, agera dåligt el fult

中文（简体） (Chinese (Simplified))
疯狂的, 愚蠢的, 生气的, 使发狂, 激怒, 发狂, 发怒

idioms:

• be mad about    疯狂于
• drive mad    令人无法接受, 令某人发疯
• go mad    发疯
• like mad    疯狂地
• mad as a hatter    发狂的, 发疯的
• mad cow disease    疯牛病
• mad keen    痴迷于, 迷恋于

中文（繁體） (Chinese (Traditional))
adj. - 瘋狂的, 愚蠢的, 生氣的
v. tr. - 使發狂, 激怒
v. intr. - 發狂, 發怒

idioms:

• be mad about    瘋狂於
• drive mad    令人無法接受, 令某人發瘋
• go mad    發瘋
• like mad    瘋狂地
• mad as a hatter    發狂的, 發瘋的
• mad cow disease    瘋牛病
• mad keen    痴迷於, 迷戀於

한국어 (Korean)
adj. - 미친 , 화가 난, 미친 듯이 흥분한, 열광한, 세찬
v. tr. - 미치게 하다, 발광 시키다, ~을 몹시 화나게 하다
v. intr. - 미치다, 미친 짓을 하다

idioms:

• be mad about    화난 , 열중한
• drive mad    미치게 하다
• go mad    미치게 하다
• like mad    미친 듯이, 맹렬히 , 필사적으로

日本語 (Japanese)
adj. - 気が狂った, 興奮した, 気違いじみた, 無謀な, 怒って, 夢中になって, 強く欲しがる, 狂犬病にかかった, 怒った, 夢中の

idioms:

• be mad about    怒って, 熱中して
• go mad    気が狂う
• hopping mad    かんかんに怒って
• like mad    猛烈に
• mad as a hatter    すっかり気が狂って
• mad cow disease    狂牛病
• mad keen    気の狂った泣き声

العربيه (Arabic)
‏(صفه) مجنون, مخبول (فعل) يجن, يصيبه خبل‏

עברית (Hebrew)
adj. - ‮משוגע, רוגז, רותח מזעם, "מת על", (חיה) נגועה בכלבת, עליז מאד, מטופש‬
v. tr. - ‮שיגע (מיושן)‬
v. intr. - ‮השתגע, התנהג כמשוגע (מיושן)‬

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mad 1	mad gab
mad catz	mad magazine