- plain
- I. a.
1.Even, level, smooth, flat, plane.2.Open, clear, unencumbered, uninterrupted.3.Manifest, visible, obvious, clear, unmistakable, apparent, certain, palpable, conspicuous, notable, notorious, glaring, patent, open, evident, distinct.4.Unequivocal, unambiguous, distinct, explicit, intelligible, perspicuous.5.Simple, unadorned.6.Homely, ugly, ill-looking, ill-favored.7.Artless, honest, sincere, candid, frank, open, downright, direct, unsophisticated, ingenuous, undesigning, straightforward, single-minded, open-hearted, above-board, unreserved.8.Artless, simple, unlearned, unsophisticated, natural, unaffected, homely, common.9.Mere, absolute, unmistakable.10.Easy, direct, clear.11.Simple, frugal, homely.12.Unornamented, unfigured, unvariegated.II. n.Plateau, champaign, savanna, pampas, table-land, champaign country.
New dictionary of synonyms. 2014.