adjective
1.
departing significantly from the normal or a norm
the abnormal rains caused flooding
Synonyms: aberrant, anomalous, atypical, deviant, deviative, heteroclite, preternatural, unrepresentative, untypical
Related Word: divergent, offtype; irregular, unnatural; uncustomary, unusual, unwonted; heteromorphic; paratypic
Contrasted words: common, familiar, natural, ordinary, regular, typical; customary, usual, wonted
Antonyms: normal
2.
Synonyms: irregular 1, anomalous, deviant, divergent, off-key, unnatural, unregular