Synonyms and Antonyms of irregular
1 departing from some accepted standard of what is normal <it was a bank customer's slightly irregular behavior that made people suspicious> Synonyms aberrant, aberrational, abnormal, anomalous, atypical, deviate, devious, deviant, unnatural, untypicalRelated Words unrepresentative; extraordinary, preternatural; rare, uncommon, uncustomary, unusual, unwonted; bizarre, curious, far-out, funny, kinky, odd, outlandish, out-of-the-way, outré, peculiar, quaint, queer, queerish, quirky, remarkable, screwy, strange, wacky (also whacky), way-out, weird, wild; eccentric, freakish, idiosyncratic, nonconformist, unconventional, unorthodox; extraordinary, preternatural; rare, uncommon, uncustomary, unusual, unwonted; odd, peculiar, strangeNear Antonyms common, commonplace, everyday, familiar, ordinary, routine, run-of-the-mill, run-of-the-mine (or run-of-mine), unexceptional, unremarkable, workaday; customary, usual, wonted; archetypal (also archetypical), average, characteristic, representativeAntonyms natural, normal, regular, standard, typical
2 lacking in steadiness or regularity of occurrence <irregular mail delivery to the island> Synonyms aperiodic, casual, catchy, choppy, discontinuous, episodic (also episodical), erratic, intermittent, fitful, occasional, spasmodic, spastic, sporadic, spotty, unsteadyRelated Words convulsive, sudden, violent; broken, disconnected, fragmentary, interrupted; aimless, arbitrary, desultory, haphazard, hit-and-miss, hit-or-miss, odd, random, scattered, slapdash, stray; capricious, changeful, changing, flickery, fluctuating, fluid, inconstant, mercurial, mutable, temperamental, uncertain, unpredictable, unsettled, unstable, varying, wavering; changeable, fickle, variable, volatileNear Antonyms changeless, equable, even, stable, stationary, uniform; unchanging, unvarying, unwavering; methodical (also methodic), orderly, systematic; unrelenting, unremittingAntonyms constant, continuous, habitual, periodic, regular, repeated, steady
3 not having a level or smooth surface <although the moon looks smooth from here, it actually has a very bumpy and irregular surface> Synonyms broken, bumpy, coarse, uneven, jagged, lumpy, pebbly, ragged, rough, roughened, rugged, scraggyRelated Words lopsided, unbalanced; inexact, unaligned; rutted, rutty, undulating, undulatory, wavy; pitted, pocked; knobbly, knobby, knurled, knurly, nubbly, nubby; burred, harsh, sandpapery, scraggly, scratchy; nonuniformNear Antonyms exact, uniform; aligned (also alined), regular, true; horizontal, tabular; plumb, straight, vertical; flushAntonyms even, flat, level, plane, smooth
4 not rigidly following established form, custom, or rules <the request is irregular, but I'll allow it> Synonyms heterodox, informal, unceremonious, unconventional, unorthodoxRelated Words unauthorized, unofficial; casual, easygoing, familiar, free and easy, lax, loose, offhand, relaxed, ultracasualNear Antonyms correct, decorous, proper; constrained, inhibited, restrained, rigid, stiff, stuffy, uptightAntonyms ceremonial, ceremonious, conventional, formal, orthodox, regular, routine
5 not staying constant <irregular gusts of wind> Synonyms changing, erratic, fluctuating, uneven, unequal, unstable, unsteady, varyingRelated Words capricious, changeable, changeful, choppy, fickle, fluid, inconsistent, inconstant, mercurial, mutable, uncertain, unsettled, variable, volatileNear Antonyms regularAntonyms changeless, constant, stable, steady, unchanging, unvarying
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