absurd, balmy, bananas, barmy, bats, batty, beany, bonkers, buggy, bughouse, bugs, crackers, cuckoo, curious, daffy, dippy, dotty, eccentric, flaky, flipped, freaked out, freaked-out, freaky, fruitcakey, fruity, funny, gaga, goofy, haywire, just plain nuts, kooky, loony, loopy, nuts, nutty, odd, oddball, off, off the hinges, off the track, out, outlandish, passing strange, peculiar, potty, quaint, queer, round the bend, screwball, screwballs, screwy, singular, slaphappy, strange, unearthly, wacky, weird, wondrous strange