bizarre, curious, eerie (also eery), far-out, funny, grotesque, kinky, outlandish, out-of-the-way, outrageous, outré, peculiar, quaint, queer, queerish, quirky, remarkable, screwy, strange, wacky (also whacky), way-out, weird, wild

baffling, bewildering, confounding, mystifying, perplexing, puzzling, shocking

aberrant, atypical, fantastic (also fantastical), flaky, freak, freakish, idiosyncratic, marvelous (or marvellous), prodigious, rare, singular, uncommon, unique, unnatural, unusual, unwonted

unconventional, uncustomary, unorthodox

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