Synonyms and related words :
abnormal, anomalous, arbitrary, capricious, crank, crankish, cranky, crotchety, deviant, deviative, different, divergent, dotty, eccentric, erratic, exceptional, fanciful, fantasied, fantastic, fey, flaky, freakish, funny, harebrained, humorsome, idiocratic, idiosyncratic, irregular, kinky, kooky, maggoty, moody, motiveless, notional, nutty, odd, oddball, peculiar, petulant, queer, screwball, screwy, singular, strange, temperamental, twisted, unconventional, unnatural, unreasonable, unrestrained, vagarious, vagrant, wacky, wanton, wayward, whimsical