plain adj
1 apparent, bold, clear, comprehensible, distinct, evident, legible, lucid, manifest, obvious, overt, patent, transparent, unambiguous, understandable, unmistakable, visible
2 artless, blunt, candid, direct, downright, forthright, frank, guileless, honest, ingenuous, open, outspoken, round, sincere, straightforward, upfront (informal)
3 common, commonplace, everyday, frugal, homely, lowly, modest, ordinary, simple, unaffected, unpretentious, workaday
4 austere, bare, basic, discreet, modest, muted, pure, restrained, severe, simple, Spartan, stark, unadorned, unembellished, unfussy, unornamented, unpatterned, unvarnished
5 ill-favoured, no oil painting (informal) not beautiful, not striking, ordinary, ugly, unalluring, unattractive, unlovely, unprepossessing
6 even, flat, level, plane, smooth n
7 flatland, grassland, llano, lowland, mesa, open country, pampas, plateau, prairie, steppe, tableland, veld
1 ambiguous, complex, concealed, deceptive, difficult, disguised, hidden, illegible, incomprehensible, inconspicuous, indiscernible, indistinct, obscure, vague, veiled
2 circuitous, indirect, meandering, rambling, roundabout
3 affected, distinguished, egotistic, ostentatious, pretentious, sophisticated, worldly
4 adorned, decorated, fancy, ornate
5 attractive, beautiful, comely, good-looking, gorgeous, handsome
6 bumpy, not level, uneven