markedly different from the usual; "a peculiar hobby of stuffing and mounting bats"; "a man...feels it a peculiar insult to be taunted with cowardice by a woman"-Virginia Woolf
much greater than the normal; "abnormal profits"; "abnormal ambition"
not normal; not typical or usual or regular or conforming to a norm; "abnormal powers of concentration"; "abnormal amounts of rain"; "abnormal circumstances"; "an abnormal interest in food"
departing from the normal in e.g. intelligence and development; "they were heartbroken when they learned their child was abnormal"; "an abnormal personality"