abnormal
American
adjective
-
not normal; deviating from the usual or typical; extraordinary
-
informal odd in behaviour or appearance; strange
Synonym Usage
See irregular.
Other Word Forms
Etymology
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
Explanation
If you get a snowstorm in the middle of July, you could say that you are experiencing “abnormal weather.” Something that is abnormal is out of the ordinary, or not typical. Abnormal is a combination of the Latin prefix ab which means “away from,” and the English word normal. It essentially means “not normal,” or "unusual.” Abnormal implies that whatever is “not normal” is also undesirable. However, abnormal is sometimes used in a positive context. The phrase “abnormal intelligence,” for instance, usually refers to someone with especially high intelligence.
Vocabulary lists containing abnormal
Lesson 1
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Cormac McCarthy's "The Road"
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"Modern Automotive Technology," Vocabulary from Section 6
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The defect involves abnormal cell death and could be detected even in patients whose disease was under good control.
From Science Daily ● Sep. 20, 2026
Staff will continue regular inspections to detect crown thinning, needle discoloration and loss, reduced growth and abnormal resin production, she said.
From Los Angeles Times ● Sep. 19, 2026
Already before El Nino hit, rivers worldwide were showing "abnormal" flows, WMO said, with 2025 among the three driest years for rivers in 35 years.
From Barron's ● Sep. 17, 2026
Hugo, who lives in Towcester, Northamptonshire, has already reached an "abnormal" 199cm tall, about 6.5ft, or 19.2 hands, to the withers or ridge at the base of the neck.
From BBC ● Sep. 10, 2026
To one side of the path, at the limit of his sight, he noticed something abnormal.
From "Fablehaven" by Brandon Mull
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
