bizarre

implausible, inconceivable, incredible, unbelievable, unimaginable, unthinkable

extravagant, grotesque

bizarro, curious, eccentric, far-out, funny, kinky, kooky (also kookie), odd, outlandish, out-of-the-way, outré, peculiar, quaint, queer, queerish, quirky, screwy, strange, wacky (also whacky), way-out, weird

farcical, laughable, ludicrous, ridiculous

Alice-in-Wonderland, Kafkaesque, nightmarish

dreamlike, surreal

aberrant, abnormal, addlepated, flaky

extraordinary, fantastic (also fantastical), freak, freakish, freaky, phantasmagoric (or phantasmagorical), phenomenal

atypical, rare, singular, uncommon, uncustomary, unique, unusual, unwonted

conspicuous, notable, noticeable, outstanding, prominent, salient, striking

atrocious, outrageous, shocking

crotchety, idiosyncratic, nonconformist, nonmainstream, out-there, unconventional, unorthodox

baffling, bewildering, confounding, mystifying, perplexing, puzzling