Synonyms and related words :
absurd, beyond belief, bizarre, cockamamie, crazy, extravagant, fantastic, foolish, freakish, grotesque, high-flown, incredible, kinky, laughable, ludicrous, monstrous, nonsensical, odd, out-of-the-way, outlandish, outrageous, peculiar, poppycockish, preposterous, ridiculous, strange, ultra, unconventional, unusual, weird, wild