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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.
Contemporary Examples

He realized that these were abnormal times and people who followed the normal rules were at risk.
Beck’s Lessons for Liberals Michael Tomasky June 28, 2011

Is there something bizarre or abnormal about this type of father-daughter relationship, their closeness?
A Sex Addiction Expert Diagnoses Lars Von Trier’s ‘Nymphomaniac’ Lizzie Crocker March 22, 2014

In MS, the amount and quality of myelin is abnormal, replaced by “sclerotic” plaques, the hallmark of the disease.
Can NASCAR Driver Trevor Bayne Race Safely With Multiple Sclerosis? Kent Sepkowitz November 12, 2013

But in our society of intense scrutiny of physical appearance, my humiliation was not an abnormal outcome of his careless actions.
Your Puffy-Face Moments, Inspired by Ashley Judd April 12, 2012

These four strains also cause the benign cervical changes that result in abnormal Pap tests.
HPV Vaccine’s Tricky Ethics Sharon Begley September 13, 2011

Historical Examples

This being so, we may very roughly describe all illusion as abnormal.
Illusions James Sully

It was composed of the grim psychological laws that govern the abnormal.
Viviette William J. Locke

A practical question is, How far could such a congregation lapse into an abnormal state and still be a church of God?
The Last Reformation F. G. [Frederick George] Smith

Mine had been a solitary life, an unusual, abnormal kind of life.
Kent Knowles: Quahaug Joseph C. Lincoln

Fatigue, of course, may also be due to the absence of such means or to abnormal conditions originated by functioning itself.
The Science and Philosophy of the Organism Hans Driesch

adjective
not normal; deviating from the usual or typical; extraordinary
(informal) odd in behaviour or appearance; strange
adj.

1835, displaced older abnormous (1742) and rival anormal (1835) under influence of Latin abnormis “deviating from a rule,” from ab- “off, away from” (see ab-) + norma “rule” (see norm). The older forms were via Old French anormal (13c.), from Medieval Latin anormalos, from Greek anomalos, from an- “not” + homalos, from homos “same.” The Greek word was altered in Latin by association with norma. Related: Abnormally.