Synonyms for Plain include:
apparent, austere, axenic, axiomatic, bare, bluff, blunt, candid, champaign, chaste, clean, clear, demonstrable, direct, dry, easy, evident, featureless, field, fine, flat-footed, forthright, frank, free-spoken, fresh, homely, honest, honorable, inelaborate, informal, light, literal, man-to-man, manifest, matter-of-fact, mere, modest, native, no-nonsense, obvious, Olympian, Olympic, open, open-and-shut, outspoken, overt, patent, plain, plainspoken, point-blank, pointed, pristine, processed, prosaic, provable, pure, purified, refined, self-evident, self-explanatory, severe, sheer, simple, simplex, solid-colored, solid-coloured, spare, square, stark, stern, straight, straight-from-the-shoulder, straightforward, subfusc, sublimate, tailored, taken for granted, tasteful, transparent, trim, ugly, unadorned, unadulterated, unalloyed, unanalyzable, unattractive, unclothed, unclouded, uncomplicated, uncontaminated, undecomposable, undecorated, unelaborate, unembellished, uninviting, unmingled, unmistakable, unmixed, unornamented, unpatterned, unpolluted, unpompous, unprepossessing, unpresentable, unpretentious, unrhetorical, unseductive, unsophisticated, unsubdivided, untufted, unvarnished, upfront, vanilla, virginal, writ large
plain is a ADJ.
apparently, evidently, manifestly, obviously, patently, plain, plainly
plain is a ADV.
champaign, field, knit, knit stitch, plain, plain stitch
plain is a NOUN.
complain, kick, kvetc, kvetch, plain, quetc, quetch, sound off
plain is a VERB.
