THESAURUS
Sparse
almost unheard-of, at a premium, broadcast, cheeseparing, chinchy, chintzy, diffuse, discrete, dispersed, dispread, disseminated, dissipated, distributed, exiguous, in short supply, inappreciable, infrequent, insignificant, limited, little, meager, miserly, niggardly, not much, occasional, out of print, out of season, out of stock, piddling, poor, rare, scant, scanty, scarce, scattered, scrimp, scrimping, scrimpy, seldom met with, seldom seen, skimp, skimping, skimpy, slim, slow, spare, sparing, sporadic, spotty, spread, spread out, sprinkled, stingy, straggling, straggly, strewn, strown, thin, tight, uncommon, unfrequent, unique, unusual, widespread
ROGET THESAURUS
Sparse
Dispersion
N
nonassemblage, dispersion, dispersion, disjunction, divergence, aspersion, scattering, dissemination, diffusion, dissipation, distribution, apportionment, spread, respersion, circumfusion, interspersion, spargefaction, affusion, waifs and estrays, flotsam and jetsam, disjecta membra waveson, unassembled &c (assemble), dispersed, sparse, dispread, broadcast, sporadic, widespread, epidemic, adrift, stray, disheveled, streaming, sparsim, here and there, passim.