Roget's Thesaurus: Entry 42 (Freedom from mixture)

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#42. [Freedom from mixture.] Simpleness. -- N. simpleness &c. adj.; purity, homogeneity.

elimination; sifting &c. v.; purification &c. (cleanness) 652.

V. render simple &c. adj.; simplify.

sift, winnow, bolt, eliminate; exclude, get rid of; clear; purify &c. (clean) 652; disentangle &c. (disjoin) 44.

Adj. simple, uniform, of a piece[Fr], homogeneous, single, pure, sheer, neat.

unmixed, unmingled[obs], unblended, uncombined, uncompounded; elementary, undecomposed; unadulterated, unsophisticated, unalloyed, untinged[obs], unfortified, pur et simple[Fr]; incomplex[obs].

free from, exempt from; exclusive.

Adv. simple &c. adj. only.