Synonyms and related words :
austere, bare, basic, chaste, chipper, elementary, essential, fundamental, groomed, homely, homespun, homogeneous, indivisible, irreducible, mere, monolithic, neat, of a piece, orderly, plain, primal, primary, pure, pure and simple, severe, shipshape, simon-pure, simple, single, snug, spare, spick-and-span, stark, tidy, trig, trim, unadorned, undifferenced, undifferentiated, uniform, well