abnormal

 
Pronunciation: /əbˈnɔːm(ə)l/

adjective

  • deviating from what is normal or usual, typically in a way that is undesirable or worrying: the illness is recognizable from the patient’s abnormal behaviour

Derivatives

abnormally

adverb

Origin:

mid 19th century: alteration (by association with Latin abnormis 'monstrous') of 16th-century anormal, from French, variant of anomal, via Latin from Greek anōmalos (see anomalous)