Dull

Synonyms: Uninteresting, tedious, wearisome, dry as dust, bland, featureless, monotonous, uninspiring, lacking variety, lacking excitement, unimaginative, lifeless, insipid, derivative, prosaic, humdrum, banal, ponderous, dull as dishwater, no great shakes, dreich, ornery, boring, tiresome, dry, flat, characterless, colourless, unexciting, unstimulating, lacking variation, lacking interest, uneventful, soulless, unoriginal, commonplace, run-of-the-mill, unremarkable, plodding, pedestrian, deadly, not up to much, and dullsville.

Synonyms: Drab, sombre, subdued, toned down, lustreless, faded, muddy, pale, dreary, dark, muted, lacklustre, colourless, washed out, watery, and subfusc.

Synonyms: Overcast, gloomy, dim, dreary, sombre, leaden, sunless, subfusc, cloudy, dark, dismal, bleak, grey, murky, and louring.

Synonyms: Muffled, quiet, softened, indistinct, smothered, muted, soft, faint, stifled, and suppressed.

Synonyms: Blunt, not sharp, unsharpened, edgeless, blunted, unkeen, dulled, and worn down.

Synonyms: Slack, flat, slow-moving, inactive, stagnant, lethargic, unenergetic, languid, inert, somnolent, weary, fatigued, apathetic, dopey, logy, neurasthenic, sluggish, slow, quiet, static, depressed, enervated, listless, torpid, sleepy, drowsy, tired, heavy, dozy, yawny, asthenic, and lymphatic.

Synonyms: Unintelligent, slow, slow-witted, doltish, stolid, empty-headed, mindless, half-witted, moronic, cretinous, dense, dim-witted, dumb, dozy, pig-ignorant, slow on the uptake, brain-dead, chuckleheaded, wooden-headed, muttonheaded, not the full shilling, stupid, dull-witted, witless, dunce-like, vacuous, brainless, foolish, idiotic, imbecilic, obtuse, dim, thick, dopey, lamebrained, bovine, soft in the head, boneheaded, dunderheaded, fat-headed, daft, and thick as two short planks.

Synonyms: Lessen, diminish, dampen, take the edge off, deaden, soften, allay, soothe, alleviate, moderate, numb, desensitize, stupefy, stun, sedate, narcotize, obtund, pale, wash out, decolour, etiolate, blacken, veil, shadow, bedim, cast a pall over, lower, shake, suppress, smother, decrease, reduce, depress, blunt, mute, tone down, ease, assuage, palliate, mitigate, benumb, render insensitive, daze, drug, tranquillize, torpefy, fade, bleach, decolorize, dim, darken, blur, obscure, fog, put a damper on, cast down, crush, sap, extinguish, and stifle.