unconventional

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

Antonyms: conventional formal normal standard usual