'abnormal' definitions:

Definition of 'abnormal'

(from WordNet)
adjective
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" [syn: abnormal, unnatural] [ant: normal]
adjective
Departing from the normal in e.g. intelligence and development; "they were heartbroken when they learned their child was abnormal"; "an abnormal personality" [ant: normal]
adjective
Much greater than the normal; "abnormal profits"; "abnormal ambition"

Synonyms of 'abnormal'

From: Moby Thesaurus