1
as in abnormal
departing from some accepted standard of what is normal
it was a bank customer's slightly irregular behavior that made people suspicious
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in sporadic
lacking in steadiness or regularity of occurrence
irregular mail delivery to the island
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3
as in uneven
not having a level or smooth surface
although the moon looks smooth from here, it actually has a very bumpy and irregular surface
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4
as in informal
not rigidly following established form, custom, or rules
the request is irregular, but I'll allow it
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5
as in changing
not staying constant
irregular gusts of wind
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as in guerrilla
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Dissimilar Words
Example Sentences
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Recent Examples of irregular
New Atlas, 2 Jan. 2026
By dramatizing and diversifying its many acts of formation, Your Name Here provides its few but devoted admirers with a surprisingly moving argument for spiky, irregular, even incomplete literature.
—Robert Rubsam, The Atlantic, 1 Jan. 2026
Paula Allen, ExpressNews.com, 15 Feb. 2020
Turkish troops then began shelling Kurdish towns in Syria, and Turkish forces pushed forward, irregulars executing people in ditches along the road.
—Time, 14 Nov. 2019
See All Example Sentences for irregular
Adjective
World-first findings on coffee and irregular heartbeat University of Adelaide and University of California, San Francisco (UCSF) researchers led a randomized clinical trial of 200 adults from Australia, the US and Canada with atrial fibrillation (AF) to test coffee's impact on irregular heartbeats.
—Noun
As volunteer companies were raised to drive out the Mexican forces — who were occupying their own country — some of the irregulars were joined by free black men.
—Recent Examples of Synonyms for irregular
Adjective
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The new guidance reflects the latest research showing that HPV tests, compared to Pap smears, can increase the detection of abnormal cells in the cervix that may lead to cancer.—
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Kickers often have an abnormal route to high-level football.—
Adjective
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The study made a significant contribution, if not clarification, to this academic niche — medieval migration wasn’t seasonal, nor sporadic and intense.—
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Trying to keep up with tariff news, especially as a consumer who isn't necessarily an expert in economic policy, can feel like dodging sporadic jump scares.—
Adjective
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Future work will focus on integrating snow-deposition modeling with PV yield simulations to more accurately predict energy losses and on expanding analyses to more complex, uneven alpine terrain.—
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The Trojans' uneven season hasn't exactly helped slow rumors either.—
Adjective
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Double islands have been used to add valuable workspace and storage in open kitchens, as well as to accommodate activities such as informal dining.—
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The Royal Moroccan Football Federation (RMFF) has scouts in different countries monitoring players who are eligible for them from a young age, but Nigeria’s approach is more informal.—
Adjective
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In some studies, gloves not changed between tasks had higher bacterial counts and could transfer germs just as easily as ungloved hands, underscoring the need for frequent changing and proper hand hygiene.—
Noun
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Born in Caracas, Rodríguez is the daughter of Marxist guerrilla leader Jorge Antonio Rodríguez, a co-founder of the Socialist League.—
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The daughter of a Marxist guerilla who rose to notoriety in the 1970s for capturing an American businessman, Rodríguez is adept at embracing contradiction in the name of political expediency.—
Adjective
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While there are certainly products that can be used across different hair textures, lengths, curl patterns, thicknesses, colors (natural and unnatural), and needs, hair products are often created with specific consumers in mind.—
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The handsome pair of actors play sniper specialists from enemy countries who must each take a long shift on opposite sides of a massive trench where some unnatural monsters apparently lurk below.—
Adjective
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Not even those who, inspired by occasional bouts of yellow fever, had sure access to fleeting moments of lucidity.—
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Today, occasional direct ferries provide a simpler two-hour crossing.—
Cite this Entry
“Irregular.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irregular. Accessed 13 Jan. 2026.
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