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
Relevance
Antonyms & Near Antonyms
2
as in sporadic
lacking in steadiness or regularity of occurrence
irregular mail delivery to the island
Synonyms & Similar Words
Antonyms & Near Antonyms
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
Synonyms & Similar Words
Antonyms & Near Antonyms
4
as in informal
not rigidly following established form, custom, or rules
the request is irregular, but I'll allow it
Synonyms & Similar Words
Antonyms & Near Antonyms
5
as in changing
not staying constant
irregular gusts of wind
Synonyms & Similar Words
Antonyms & Near Antonyms
as in guerrilla
Related Words
Dissimilar Words
Example Sentences
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Recent Examples of irregular
Jon Wertheim,
CBS News,
28 June 2026
Many have irregular or pock-marked shapes, while others have a smooth crust from their time burning up in our atmosphere.
—
Adam Lark,
Scientific American,
28 June 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
If market watchers can spot irregular trades, surely enemies can, too.
—
Jon Wertheim,
CBS News,
28 June 2026
Many have irregular or pock-marked shapes, while others have a smooth crust from their time burning up in our atmosphere.
—
Adam Lark,
Scientific American,
28 June 2026
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.
—
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
Recent Examples of Synonyms for irregular
Adjective
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In this context, when screening healthy asymptomatic people who aren’t at high risk, the chance at an ideal screening result of identifying abnormal tissue that can be eliminated is very low.
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The abnormal heat has been driven by the onset of El Niño, a natural climate pattern characterized by unusually warm waters along the equatorial tropical Pacific Ocean.
Adjective
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The only other competitors were the Anglo-French Concorde and the sporadic Soviet Tupolev Tu-144 program.
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Redevelopment in downtown Miami and the accidental discovery of the mysterious Miami Circle in 1998 have ushered in a quarter-century of sporadic but remarkable archaeological revelations.
Adjective
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If visible pores or uneven texture is a concern for you at all, this primer is the ultimate solution.
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As with that earlier boom-and-bust cycle, the AI landscape is likely to yield uneven outcomes, according to Qian Wang, global head of capital market research at Vanguard, and senior global economist Kevin Khang.
Adjective
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Authorities are also investigating the death of a Malawian man after he was allegedly killed by a mob at an informal settlement in the city of Pietermaritzburg, near Durban.
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It is joined by an adjoining family room and informal dining area.
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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Cepeda had participated in and continued throughout the campaign to promote negotiations with guerrillas and cartels.
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As part of this shift, Cuban officers are opting to train soldiers in guerrilla tactics rather than conventional warfare — a strategic departure corroborated by Cancian that is also evident in the footage.
Adjective
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Even after extensive engineering, Coach Eve would take about three seconds to reply to a question—a delay users felt was uncomfortable and unnatural.
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His speech was an unnatural blur.
Adjective
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Luke Russert joined his father for major political conventions and occasional shows on the road, Fischer Martin said.
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This frequent, high-profile casting strategy, distinct from occasional star cameos, transforms 'Oh, Mary' into a dynamic, high-demand theatrical experience.
Cite this Entry
“Irregular.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irregular. Accessed 5 Jul. 2026.
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