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

The early-voter turnout, which figures to be heavily Democratic, is abnormally high.
The Hot Shot Democrat You’ve Never Heard Of Sean Wilentz November 1, 2008

In other words, we feel that we are moving at a slow, stately rate through a universe whose contents have been abnormally slowed.
New York on Quaaludes Blake Gopnik April 22, 2013

These numbers are partly due to an abnormally high number of traffic deaths.
New Social Progress Index Ranks U.S. 16th Out of 132 Countries Brandy Zadrozny April 2, 2014

Rove is abnormally skilled at convincing the audience that the pawn moved on its own to that particular square on the chess board.
Behind Rove’s Latest Lies James C. Moore August 12, 2009

Historical Examples

A further observation made by the investigator is that the chicks which obtained the lowest amount of lime were abnormally weak.
The Dollar Hen Milo M. Hastings

She also saw that Dick was abnormally excited, and suspected that he had been drinking.
Viviette William J. Locke

They are at one and the same time abnormally truthful, and abnormally sensitive.
The Benefactress Elizabeth Beauchamp

Not a gun will be in sight, and the battery will be abnormally light.
Christopher Columbus and His Monument Columbia Various

He strove to comfort her, to amuse her, but what form of distraction could be made to appeal to that abnormally apathetic nature?
The Nabob, Volume 1 (of 2) Alphonse Daudet

In 15.5% we find trochocephalous or abnormally round heads (index 91).
Criminal Man Gina Lombroso-Ferrero

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

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.

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