1. abnormal (vs. normal), unnatural, aberrant, deviant, deviate, anomalous, antidromic, atypical, irregular, brachydactylic, brachydactylous, defective, freakish, kinky, perverted, subnormal, supernormal, vicarious, insane

usage: 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"

2. abnormal (vs. normal), exceptional(prenominal)

usage: departing from the normal in e.g. intelligence and development; "they were heartbroken when they learned their child was abnormal"; "an abnormal personality"

3. abnormal, immoderate (vs. moderate)

usage: much greater than the normal; "abnormal profits"; "abnormal ambition"

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See also: abnormal (Dictionary)