Spartan, arcadian, ascetic, austere, bald, bare, basic, blank, bucolic, candid, chaste, common, commonplace, direct, dry, dull, elementary, essential, frank, fundamental, genuine, homely, homespun, homogeneous, inartificial, indivisible, irreducible, lean, matter-of-fact, mere, monolithic, naked, native, natural, naturelike, neat, nude, of a piece, open, pastoral, plain-speaking, plain-spoken, plain, primal, primary, prosaic, prosing, prosy, pure, pure and simple, rural, rustic, severe, sheer, simon-pure, simple-speaking, simple, single, sober, spare, stark, straightforward, unadulterated, unaffected, unarrayed, unartificial, unassuming, uncluttered, uncomplicated, undecked, undecorated, undesigning, undifferenced, undifferentiated, undisguising, undissembling, undissimulating, undressed, unelaborate, unembellished, unenhanced, unfeigning, unfurbished, ungarnished, uniform, unimaginative, unornamented, unostentatious, unpoetical, unpretending, unpretentious, unsophisticated, unspoiled, untrimmed, unvarnished