unconventional?

synonyms from thesaurus.com:

anarchistic, atypical, avant-garde, beat, bizarre, crazy, eccentric, far-out, freakish, freaky, free and easy, idiosyncratic, individual, individualistic, informal, irregular, kinky, kooky, nonconformist, oddball, off the beaten track, off the wall, offbeat, original, out in left field, out of the ordinary, unceremonious, uncommon, uncustomary, unique, unorthodox, unusual, way-out, weirdo