bright, lively, sharp, sharpen

boring, dreary, unexciting, monotonous, drab, bland, uninteresting, humdrum, turgid, uninspiring, forgettable, tedious, dour, uninspired, soporific, insipid, unmemorable, passionless, depressing, banal, unremarkable, unentertaining, pedantic, spiritless, ponderous, leaden, joyless, mundane, pleasant, unrewarding, trite, humorless, pallid, stale, desultory, listless, formulaic, unenjoyable, charmless, pointless, unsatisfying, morose, staid, unadventurous, lifeless, ropey, cheerless, uninventive, stilted, featureless, tiresome, prosaic, cheesy, blah, maudlin, unaffecting, sedate, uneventful, stodgy, unimaginative, hackneyed, wittedness, indistinctive, colorless, wearisome, unbeautiful, juiceless, undynamic, unsexy, hokey, stuffy, clunky, unchallenging, uninviting, overfamiliar, eventless, perfunctory, draggy, flaccid, drear, predictable, unglamorous, dullish, soulless, cliched, lackluster, talky, unenlightening, pretentious, aimless, jaded, rote, dissatisfying, torpid, stultifying, stagey, monochromatic, muzzy, gloomy, silly, melodramatic, mediocre, arrow, crayon, heavy, nail, nails, nick, radiate, smack, stuff, throbbing, tick, un, adam, an, aud, bang, bit, bloom, bluff, bob, duller, bright, drowsy, dullest, brighter, carefree, lovely, miserable, sadder, sickly, sleepy, pleasanter, queer, calmer, cheerful, dreamy

cloud

., ache, aching, achy, american olive, amorpha canescens, animallike, antbird, ant bird, atomic number 82, avocado, banal, bastard toadflax, beefsteak morel, besot, betula pubescens, blood-twig, blunt, blunted, boletus zelleri, bovine, brain mushroom, bromidic, brutish, buckleya, buckleya distichophylla, bullace grape, butter knife, buttoned-down, california condor, catocala nupta, characterless, chug, cloddish, cloud, clump, clunk, comandra pallida, commonplace, common european dogwood, cornus sanguinea, corny, crump, cypripedium montanum, deadly, devilwood, dog, doltish, dork, downy birch, drab, drone, dry, dulled, dun, dusky salamander, fen orchid, fen orchis, feverroot, frump, genus pernis, gracilariid, gracilariid moth, gratification, growl, grumble, grumbling, gymnogyps californianus, gyromitra esculenta, gyromitra infula, haze, helvella sulcata, hoenir, horse gentian, hue, humdrum, jerk, juiceless, lackluster, lead, leadplant, lead plant, letter opener, lilium martagon, liparis, liparis loeselii, logginess, loginess, lymantriid, marsh felwort, martagon, mental anguish, menticirrhus littoralis, mosstone, moss green, mountain lady's slipper, muscadine, noctuid, noctuid moth, nondescript, olive-drab uniform, olive drab, osmanthus americanus, owlet moth, paperknife, paper knife, pb, pedwood, pernis, phylloscopus sibilatrix, platitudinal, platitudinous, ponderous, prosaic, prose, psilotum nudum, red dogwood, red underwing, rehash, ridiculous, rumble, rumbling, saddled-shaped false morel, satin, silver whiting, skeleton fork fern, slow, sober, solitaire, somber, sombre, spadework, sparrow, staleness, stodginess, stodgy, stone, stuffiness, stuffy, stupefaction, stupefy, stupefying, swertia perennia, thud, thump, thumping, thunk, tineoid, tineoid moth, tinker's root, triostium perfoliatum, triteness, trivial, true sparrow, turk's-cap, tussock moth, unanimated, underwing, unglamorous, unglamourous, unintelligent, uninteresting, unpointedness, unpolished, vague, vegetative, vivify, white birch, wild coffee, wood warbler

alter, change, desensitize, soften, weaken

arid, benumb, blunt, blunted, boring, bovine, cloudy, damp, dampen, deadened, deadening, dense, desiccate, desiccated, dim, drab, dreary, dulled, dumb, edgeless, flat, gray, grey, heavy, ho-hum, humdrum, inactive, insensitive, irksome, lackluster, lacklustre, leaden, lusterless, lustreless, mat, matt, matte, matted, monotonous, muffle, muffled, mute, muted, nonresonant, numb, obtuse, pall, slow, sluggish, soft, softened, stupid, tedious, thudding, thumping, tiresome, tone down, uninteresting, unreverberant, unsaturated, unsharpened, wearisome