irregular
Americanadjective
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without symmetry, even shape, formal arrangement, etc..
an irregular pattern.
- Synonyms:
- uneven, unsymmetrical
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not characterized by any fixed principle, method, continuity, or rate.
irregular intervals.
- Synonyms:
- lawless, eccentric, erratic, capricious, disorderly, unsystematic, unmethodical
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not conforming to established rules, customs, etiquette, morality, etc..
highly irregular behavior.
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not according to rule, or to the accepted principle, method, course, order, etc.
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Grammar. not conforming to the prevalent pattern or patterns of formation, inflection, construction, etc., of a language; having a rule descriptive of a very small number of items.
The English verbs “keep” and “see” are irregular in their inflections.
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Military. (formerly, of troops) not belonging to an organized group of the established forces.
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flawed, damaged, or failing to meet a specific standard of manufacture.
a sale of irregular shirts.
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Botany.
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not uniform.
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(of a flower) having the members of some or all of its floral circles or whorls differing from one another in size or shape, or extent of union.
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deviating or experiencing deviations from a normally regular or cyclic body function, as bowel habits or menstruation.
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(of a stock or commodity market) of mixed market activity; showing no clear up or down trend.
noun
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a person or thing that is irregular.
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Commerce. a product or material that does not meet specifications or standards of the manufacturer, as one having imperfections in its pattern.
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Military. a soldier or combatant not of a regular military force, as a guerrilla or partisan.
adjective
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lacking uniformity or symmetry; uneven in shape, position, arrangement, etc
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not occurring at expected or equal intervals
an irregular pulse
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differing from the normal or accepted practice or routine
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not according to established standards of behaviour; unconventional
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(of the formation, inflections, or derivations of a word) not following the usual pattern of formation in a language, as English plurals ending other than in -s or -es
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of or relating to guerrillas or volunteers not belonging to regular forces
irregular troops
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(of flowers) having any of their parts, esp petals, differing in size, shape, etc; asymmetric
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(of merchandise) not up to the manufacturer's standards or specifications; flawed; imperfect
noun
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a soldier not in a regular army
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(often plural) imperfect or flawed merchandise Compare second 1
Related Words
Irregular, abnormal, exceptional imply a deviation from the regular, the normal, the ordinary, or the usual. Irregular, not according to rule, refers to any deviation, as in form, arrangement, action, and the like; it may imply such deviation as a mere fact, or as regrettable, or even censurable. Abnormal means a deviation from the common rule, often implying that this results in an aberrant or regrettably strange form or nature of a thing: abnormal lack of emotion; A two-headed calf is abnormal. Exceptional means out of the ordinary or unusual; it may refer merely to the rarity of occurrence, or to the superiority of quality: an exceptional case; an exceptional mind. Because of the stigma of abnormal, exceptional is today frequently substituted for it in contexts where such a euphemism may be thought to be appropriate: a school for exceptional children (children who are abnormal in behavior, mental capacity, or the like).
Other Word Forms
- irregularly adverb
- quasi-irregular adjective
- quasi-irregularly adverb
Etymology
Origin of irregular
First recorded in 1350–1400; from Late Latin irrēgulāris ( ir- 2, regular ); replacing Middle English irreguler, from Middle French
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.
Paramedics found Good unresponsive with an irregular pulse, and she was pronounced dead in the ambulance on the way to hospital, according to the report seen by CBS.
From BBC
It finds the misfiring heart tissue and zaps the electrical nodes causing an irregular heartbeat.
From Barron's
Rather than a clean, repeating lattice, the atoms form a hybrid and irregular sequence that can only be detected using extremely precise measurement techniques made possible by advanced X-ray lasers.
From Science Daily
The findings may help explain labor problems marked by weak or irregular contractions that prolong delivery.
From Science Daily
Research published on December 29, 2025, in Neurology, the medical journal of the American Academy of Neurology, found that people with weaker and more irregular circadian rhythms were more likely to develop dementia.
From Science Daily
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.
