sporadic

1 lacking in steadiness or regularity of occurrence sporadic loud noises kept startling everyone Synonyms aperiodic, casual, catchy, choppy, discontinuous, episodic (also episodical), erratic, intermittent, irregular, occasional, spasmodic, spastic, fitful, 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

2 not often occurring or repeated so long as the complaints remain sporadic, we're doing fine Synonyms isolated, occasional, odd, rare, infrequentRelated Words scarce, scattered, uncommon, unique, unusual; choppy, discontinuous, erratic, fitful, intermittent, irregular, spasmodic, spotty, unsteadyNear Antonyms daily, regular; common, ordinary, routineAntonyms frequent