not normal, average, typical, or usual; deviating from a standard: abnormal powers of concentration; an abnormal amount of snow; abnormal behavior.
extremely or excessively large: abnormal profit.
Origin of abnormal
First recorded in 1850–55; ab- + normal; replacing anormal, from Medieval Latin anōrmālus, variant of anōmālus anomalous, influenced by Latin norma norm
Within hours, they learned there were 27 cases — seven of them severe — with fever, difficulty breathing and a buildup of abnormal substances in the lungs.
Inside the Fall of the CDC|by James Bandler, Patricia Callahan, Sebastian Rotella and Kirsten Berg|October 15, 2020|ProPublica
It not only increases the spread of misinformation, … it also groups people together so that their incorrect ideas don’t seem as abnormal as they otherwise would.
Empathy is an underrated weapon in fighting vaccine skepticism|jakemeth|October 13, 2020|Fortune
The problem, though, is that this advice presumes that death threats are rare and abnormal.
Cover-Ups and Concern Trolls: Actually, It's About Ethics in Suicide Journalism|Arthur Chu|January 3, 2015|DAILY BEAST
As the system booted up, Beck noticed that an abnormal number of terminals were active.
The Intern Who Birthed The KAL007 Conspiracy Theories|Tim Mak|September 8, 2014|DAILY BEAST
Robyn was in her senior year of college in January 2008 when she found out she had an abnormal pap smear.
The Silent Shame of HPV|Emily Shire|August 29, 2014|DAILY BEAST
Erica was 22 when her doctor called her and said she had an abnormal pap smear.
The Silent Shame of HPV|Emily Shire|August 29, 2014|DAILY BEAST
Neurologist Oliver Sacks says the syndrome helps give the Team USA goalie ‘abnormal quickness.’
Why Tourette’s May Be Tim Howard’s Secret Weapon on the Field|Michael Daly|July 3, 2014|DAILY BEAST
This is not an abnormal action, but is of necessity, or asphyxia would instantly result and the runner would drop.
Scientific American Supplement No. 275|Various
The conversation, freed by the sense of the abnormal, rose about me without restriction.
The Wasted Generation|Owen Johnson
She felt it abnormal, just as she recognized the essential if duly veiled normality of her husband and younger son.
The Patrician|John Galsworthy
Disease, as he viewed it, was primarily the result of abnormal conditions of living.
Swirling Waters|Max Rittenberg
There is also much doubt as to the way in which the statisticians have used the term "abnormal" or "defective."
Mentally Defective Children|Alfred Binet
British Dictionary definitions for abnormal
abnormal
/ (æbˈnɔːməl) /
adjective
not normal; deviating from the usual or typical; extraordinary
informalodd in behaviour or appearance; strange
Derived forms of abnormal
abnormally, adverb
Word Origin for abnormal
C19: ab-1 + normal, replacing earlier anormal from Medieval Latin anormalus, a blend of Late Latin anōmalusanomalous + Latin abnormis departing from a rule