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
Ameya Paleja, Interesting Engineering, 23 Mar. 2026
Extremely high doses can lead to irregular heartbeats or even cause the heart to stop altogether, according to Cedars-Sinai Medical Center.
—Theara Coleman, TheWeek, 23 Mar. 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
Particles in this time crystal move in an irregular, nonreciprocal manner, opening new possibilities for technology and industry.
—Ameya Paleja, Interesting Engineering, 23 Mar. 2026
Extremely high doses can lead to irregular heartbeats or even cause the heart to stop altogether, according to Cedars-Sinai Medical Center.
—Theara Coleman, TheWeek, 23 Mar. 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
-
The beginning of a new month signaled the end of abnormal March weather.—
Julie Mendes,
AZCentral.com,
1 Apr. 2026
-
This month, the zoo announced Tina was suffering from an infection and abnormal buildup of fluid in her uterus.—
Lila Seidman,
Los Angeles Times,
31 Mar. 2026
Adjective
-
The data points to a genuine enhancement in the sporadic fireball background at the large-object end of the size distribution.—
Joe Edwards,
MSNBC Newsweek,
30 Mar. 2026
-
The two sides have engaged in sporadic retaliatory aerial attacks in recent years, though the fighting between them had largely simmered down in recent months.—
Mike Brest,
The Washington Examiner,
30 Mar. 2026
Adjective
-
Accessibility Due to Lupaia’s location on a steep hilltop with gravel pathways and naturally uneven grounds at various levels, this resort is not wheelchair accessible.—
Condé Nast,
Condé Nast Traveler,
3 Apr. 2026
-
The truth is that the track record for Olympic host cities is pretty uneven.—
Encyclopedia Britannica,
Encyclopedia Britannica,
2 Apr. 2026
Adjective
-
Food and drink Head to Cugino for breakfast or an informal lunch.—
Condé Nast,
Condé Nast Traveler,
31 Mar. 2026
-
Through performances, activations, and informal exchanges, visitors are invited to share personal stories that become part of an evolving audio component.—
Olga Garcia-Mayoral,
Miami Herald,
31 Mar. 2026
Adjective
-
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.—
Evan Moore
December 19,
Charlotte Observer,
19 Dec. 2025
Noun
-
Hezbollah, established that year, waged a guerrilla campaign that eventually ended the Israeli occupation in 2000.—
ABC News,
ABC News,
26 Mar. 2026
-
Repression in this small northern province had been especially fierce, as guerrilla groups had controlled large parts of the territory before the coup.—
Débora Rey,
Los Angeles Times,
24 Mar. 2026
Adjective
-
As his band’s popularity and star power rise, so does Lestat’s influence over vampires and humans alike, leaving others to contend with Lestat’s power in the face of the Great Conversion, an unnatural surge in the vampire population.—
Rosy Cordero,
Deadline,
27 Mar. 2026
-
While some can be used across different hair textures, lengths, curl patterns, thicknesses, colors (natural and unnatural), and concerns, many are created with specific consumers and their needs in mind.—
Lily Wohlner,
Allure,
18 Mar. 2026
Adjective
-
At a moment when our attention is fractured across phones, feeds, and tabs, the gap between occasional readers and obsessive ones has never felt wider.—
Literary Hub,
Literary Hub,
2 Apr. 2026
-
Wild temperature swings and occasional chances of rain remain in the forecast through the rest of the week.—
Cutter Martin,
CBS News,
2 Apr. 2026
Cite this Entry
“Irregular.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irregular. Accessed 3 Apr. 2026.
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