Roget's Thesaurus: Entry 576 (Plainness)

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#576. Plainness. -- N. plainness &c. adj.; simplicity, severity; plain terms, plain English; Saxon English; household words

V. call a spade "a spade"; plunge in medias res; come to the point.

Adj. plain, simple; unornamented, unadorned, unvarnished; homely, homespun; neat; severe, chaste, pure, Saxon; commonplace, matter-of-fact, natural, prosaic.

dry, unvaried,monotonous &c. 575.

Adv. in plain terms, in plain words, in plain English, in plain common parlance; point-blank.