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The definition of plain

Synonyms:	open, bare, honest, plateau, prairie, grassland, mesa, lowland, steppe, pampas, tableland, veld, llano, simple, basic, severe, pure, modest, stark, restrained, mute, discreet, austere, Spartan, unvarnished, clear, obvious, patent, evident, apparent, visible, distinct, manifest, transparent, overt, unmistakable, lucid, comprehensible, legible, straightforward, direct, frank, bold, blunt, sincere, outspoken, downright, candid, forthright, upfront (informal), artless, ingenuous, guileless, ugly, ordinary, homely (U.S. Canad.), unlovely, ill-favoured, common, everyday, commonplace, lowly, unaffected, frugal, workaday
Antonyms:	ornate, hidden, roundabout, attractive, sophisticated

From Collins