Meaning of ABNORMAL in English

ABNORMAL

ab ‧ norm ‧ al AC /æbˈnɔːm ə l $ -ˈnɔːr-/ BrE AmE adjective

[ Word Family: noun : NORMALITY/NORMALCY ≠ ↑ abnormality , ↑ normal , ↑ normalization ; verb : ↑ normalize ; adverb : ↑ normally ≠ ↑ abnormally ; adjective : ↑ normal ≠ ↑ abnormal ]

[ Date: 1800-1900 ; Origin: ab- 'away from, not' (from Latin ab- 'away, off' ) + normal ]

very different from usual in a way that seems strange, worrying, wrong, or dangerous OPP normal :

abnormal behaviour

an abnormal level of cholesterol

My parents thought it was abnormal for a boy to be interested in ballet.

—abnormally adverb :

an abnormally high pulse rate

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.