1 insane, deranged, crazy, crazed, demented, lunatic, unhinged, delirious, out of one's mind or head, psychotic, maniacal, (mentally) unbalanced, mentally ill, of unsound mind, non compos mentis, Chiefly Brit daft, Colloq out of one's head, touched (in the head), screwy, cuckoo, mental, certifiable, having a screw loose, dotty, cracked, mad as a March hare, mad as a hatter, not all there, off-the-wall, stark raving mad, Chiefly Brit potty, US nutty as a fruit cake; Slang nuts, loony, goofy, loopy, crackers, batty, off one's rocker or trolley, bananas, Brit round the bend or twist, twisted, off one's chump, barmy or balmy, bonkers, US out to lunch, bughouse, bugs, crazy as a bedbug or a coot, loco, wacky, out of one's tree, meshuga:
You're mad if you think I'm going in there with that lion.
2 foolish, silly, childish, immature, puerile, wild, nonsensical, foolhardy, madcap, heedless, senseless, absurd, imprudent, unwise, indiscreet, rash, ill-advised, ill-considered, reckless, extravagant, irrational, fatuous:
I did many mad things when I was a student. Hitching to Inverness is a mad idea
3 wild, ferocious; rabid:
Have they caught that mad dog yet?
4 furious, angry, infuriated, incensed, enraged, irate, fuming, berserk, irritated, provoked, wrathful, exasperated, Literary wroth:
Will you get mad if I ask you a question? Please don't be mad with me - I wrecked your car
5 like mad. madly, feverishly, in a frenzy, frenziedly, desperately, excitedly, violently, wildly, hysterically, furiously; enthusiastically, fervently, ardently; Colloq like crazy:
He's been running about like mad trying to find her.
6 mad (about or for). crazy, infatuated, ardent, enthusiastic, eager, avid, zealous, passionate, fervent, fervid, keen, fanatical, wild, Colloq hooked, Brit dotty, Slang nuts:
She's absolutely mad about cricket.
1 not sane; crazy/stupid
be, look, seem | go
He went mad and spent the rest of his life locked up in a mental hospital. The world had gone completely mad.
| drive sb
His experiences in the First World War drove him mad. The children are driving me mad!
| consider sb, think sb
Her colleagues thought her quite mad.
| pronounce sb
absolutely, completely, quite, utterly | barking, (stark) raving
What a barking mad idea! You must be stark raving mad to risk your money like that!
| almost | a bit, half, a little, slightly | dangerously
I went mad with joy and danced a little jig.
be, feel, look | get
I get so mad when people don't take me seriously.
| make sb
It makes me really mad when people waste food.
hopping, really | absolutely | pretty
My mum's absolutely mad with me!
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