frequent

frequent, occasional, sporadic, intermittent, uncommon, commonplace, periodic, rare, atypical, mundane, inconsequential, repetitive, insignificant, incidental, limited, sparse, uneventful, trivial, unplanned, hypopnea, fleeting, spotty, predictable, unsustained, unheard, repetitious, minimal, erratic, unproductive, habitual, isolated, unrewarding, innocuous, eventless, spasmodic, uninteresting, costly, occupational hazard, inconvenient, nocturnal, unremarkable, annoying, negligible, unusual, regular, routine, hypoactive, perfunctory, unnoticeable, unpredictable, spontaneous, insubstantial, irregular, nonexistent, recurrent, unscheduled, unwelcome, numerable, irritative, such, inadvertent, prone, forgetful, nonprogressive, tedious, ephemeral, bothersome, unaffected, unavoidable, lengthier, unfruitful, obscure, unforthcoming, restricted, subsequent, apneic, fitful, monosyllabic, reticent, minor, unreliable, solitary, incessant, fruitless, distractible, unsociable, unsuccessful, harmless, tangential, impulsive, predicable, unproblematic, unthreatened, exceptionable, scarce, banal, typical, persistent, tiresome, mild, episodic, briefest, briefly, arbitrary, correspond, docs, foreign, improbable, operate, pertains, plausible, advanced, approximate, be, believe, bushels, captures, corresponds, deserving, direct, eligible, entails, unfrequent, commonest, quent, rarer, worrisome, unpredicted, distressing, puzzling, coincidental, accidental, attested, pathological, unexpected, welldocumented

constipated, constipation, irregularity, magicicada septendecim, oligomenorrhea, periodical cicada, seventeen-year locust