bizarre
abnormal, comical, curious, eccentric, extraordinary, fantastic, freakish, grotesque, left-field (informal) ludicrous, odd, oddball (informal) off-beat, off the rails, off-the-wall (slang) outlandish, outré, peculiar, queer, ridiculous, rum (Brit. slang) strange, unusual, wacko (slang) way-out (informal) weird, zany
Antonyms
common, customary, normal, ordinary, regular, routine, standard, typical