crazy

1. strange, odd, bizarre, fantastic, silly, weird, ridiculous, outrageous, peculiar, eccentric, rum, oddball, cockamamie, whacko, out there

2. ridiculous, wild, absurd, inappropriate, foolish, ludicrous, irresponsible, unrealistic, unwise, senseless, preposterous, potty, short-sighted, unworkable, foolhardy, idiotic, nonsensical, half-baked, inane, fatuous, ill-conceived, quixotic, imprudent, impracticable, cockeyed, bird-brained, cockamamie

3. insane, mad, unbalanced, deranged, touched, cracked, mental, nuts, barking, daft, batty, crazed, lunatic, demented, cuckoo, barmy, off-the-wall, nutty, potty, berserk, delirious, bonkers, idiotic, unhinged, loopy, crackpot, out to lunch, round the bend, barking mad, out of your mind, maniacal, not all there, doolally, off your head, off your trolley, round the twist, up the pole, of unsound mind, not right in the head, off your rocker, not the full shilling, a bit lacking upstairs, as daft as a brush, mad as a hatter, mad as a March hare, nutty as a fruitcake

4. fanatical, wild, mad, devoted, enthusiastic, passionate, hysterical, ardent, very, keen, zealous, smitten, infatuated, enamoured