dull

Strongest matches

boring, dim, dumb, simple, slow, sluggish, stupid

Strong matches

addled, low, shallow

Weak matches

backward, besotted, brainless, daffy, daft, dense, dim-witted, doltish, feeble-minded, half-baked, ignorant, imbecilic, indolent, insensate, moronic, not bright, numskulled, obtuse, scatterbrained, simple-minded, stolid, thick, unintellectual, vacuous, wearisome, witless

Strongest matches

boring, flat, lifeless, listless, placid, quiet, slow, sluggish

Strong matches

accustomed, blank, callous, depressed, empty, even, slack, still

Weak matches

apathetic, colorless, dead, heavy, impassible, inactive, indifferent, inert, insensible, jejune, languid, lumpy, monotonous, passionless, prosaic, regular, routine, spiritless, stagnant, stolid, torpid, unexciting, unresponsive, unsympathetic, usual, vacuous

Strongest matches

dismal, dreary, dry, flat, humdrum, ordinary, repetitive, stale, stupid, tame, tedious, tiresome, uninspiring

Strong matches

abused, driveling, plain, stock, tired

Weak matches

archaic, arid, big yawn, blah, colorless, common, commonplace, dead, familiar, hackneyed, heavy, ho-hum, hoary, insipid, jejune, longwinded, mid, monotonous, oft-repeated, out-of-date, pointless, prolix, prosaic, prosy, repetitious, routine, run-of-the-mill, soporific, trite, unimaginative, usual, usual thing, vapid, worn-out

Strongest match

flat

Strong matches

blunt, blunted, round, square

Weak matches

edentate, edentulate, edgeless, not keen, obtuse, pointless, toothless, unpointed, unsharpened

Strongest matches

boring, flat, lifeless, listless, placid, quiet, slow, sluggish, tight

Strong matches

accustomed, depressed, even, slack, still, yawn

Weak matches

apathetic, blah, dead, draggy, falling-off, inactive, inert, languid, monotonous, regular, routine, sitting tight, slothful, stagnant, stolid, torpid, unexciting, unresponsive, usual, without incident

Strongest matches

cloudy, cold, dark, dim, dismal, flat, hazy, lifeless, muddy, muted, obscure, soft, somber, subdued

Strong matches

black, blind, dun, faded, low, matte, muffled, overcast, plain, sober, softened

Weak matches

ashen, colorless, dead, dingy, dusky, feeble, grimy, indistinct, leaden, mousy, murky, opaque, shadowy, sooty, subfusc, toned-down, unlit