Similar word to unfrequent:

exiguous, few and far between, imperceptible, inconsequential, inconsiderable, infrequent, insufficient, lean, less, meager, middling, minor, minority, minute, negligible, not many, not too many, occasional, paltry, petty, piddling, rare, scant, scanty, scarce, scarcely any, scattered, scattering, seldom, semioccasional, short, skimpy, slender, slight, slim, some, sparse, sporadic, stingy, straggling, thin, trifling, uncommon, unfrequent, widely spaced


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