adamant, adamantine, ahead, align, arrange, array, artless, atone, austere, awl, blade, blunt, boredom, boring, callous, categorical, compensate, deck, degree, direct, directly, drab, dry, dull, easy, emphatic, equal, equalize, erect, even, evened, fender, firm, flat, flatbed, flatland, flatten, forthright, franking, frugal, hard, hard-boiled, hard-core, hardboiled, hardcore, homely, homespun, humdrum, inartificial, insipid, jejune, landed, league, level, line, moiety, mud-guard, mudguard, peer, peered, pitch, plain, plan, planar, plane, plat, plumb, plump, point-blank, ponderous, prosy, range,
rank, recto, redress, right, rigid, row, rustic, same, schedule, scheme, sheepish, simple, simple-minded, simpleminded, slap, smooth, splash-board, splashboard, squarely, standard, steady, step, stiff, stodgy, straight, straighten, straightforward, string, strong, stuffy, succession, suggest, tabular, tantamount, tedious, tiresome, tough, two-dimensional, unaffected, uninspired, uninspiring, uninteresting, unlearned, unsophisticated, upright, wearisome, wing, winging