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Definition of dull : 1. Furnishing little delight, spirit, or variety; uninteresting; tedious; cheerless; gloomy; melancholy; depressing; as, a dull story or sermon; a dull occupation or period; hence, cloudy; overcast; as, a dull day.
2. Heavy; gross; cloggy; insensible; spiritless; lifeless; inert.
3. Insensible; unfeeling.
4. Not bright or clear to the eye; wanting in liveliness of color or luster; not vivid; obscure; dim; as, a dull fire or lamp; a dull red or yellow; a dull mirror.
5. Not keen in edge or point; lacking sharpness; blunt.
6. Slow in action; sluggish; unready; awkward.
7. Slow of understanding; wanting readiness of apprehension; stupid; doltish; blockish.
8. To become dull or stupid.
9. To deprive of liveliness or activity; to render heavy; to make inert; to depress; to weary; to sadden.
10. To deprive of sharpness of edge or point.
11. To make dull, stupid, or sluggish; to stupefy, as the senses, the feelings, the perceptions, and the like.
12. To render dim or obscure; to sully; to tarnish.

Synonyms:

dawdling, delaying, black, grave, rusty, accustomed, mind-numbing, dimmed, wearying, monochromatic, subdued, soggy, dismal, dun, airheaded, numbing, wordy, chuckleheaded, clouded, daunt, chapped, cirrus, moisten, fascinating, attitude, underfunded, deadening, uninspiring, dispirited, burning, sulky, inactive, non compos mentis, frighten off, skew, wearing, excite, brainless, pack a punch, platitudinous, round, chronic, murky, uninspired, verbose, happy, turned, simple, awareness, sordid, dampen, stuporous, unsaturated, slack, dirty, conventional, hushed, wistful, quieten, matted, unreverberant, tiring, matte, hollow, silent, muddy, lively, increase, wooden, square, dash, jade, tone down, irksome, moderate, bright, desiccated, banal, color, broken, exciting, feelings, acute, unhappy, simple-minded, routine, strangle, trite, agonising, cirrocumulus, gradual, thudding, regular, melancholic, dim-witted, blunted, stereotypical, cloudy, archaic, tame, tardy, unintelligent, cumulus, fatuous, low, nonresonant, silly, sad, lingering, opaque, well-known, barbed, soft, dejected, anesthetic, achy, prosy, backward, brain-dead, decide, blind, frighten away, light, pedestrian, vapid, usual, give, procrastinating, empty-headed, common, barren, wan, feeble-minded, unimaginative, scare off, down, stereotyped, windy, purblind, wash, bank, birdbrained, ho-hum, trivial, smother, weariful, stagnant, dysphoric, grimy, plangent, stimulating, keen, spiritless, sterile, colorful, untapped, dorky, aseptic, abused, fatiguing, dilatory, pinheaded, thick, ability, bass, resonant, washy, hoary, slow-witted, left-handed, unsmart, sharp, vacuous, sober, even, lowering, bland, repetitive, wispy, heavy-hearted, well-worn, mat, addled, pitchy, overclouded, Grey, desiccate, low-pitched, colors, gormless, moronic, long-winded, muted, antediluvian, grip, drear, retarded, blockheaded, pall, drudging, matt, softened, bubbleheaded, unhealthy, thickheaded, speechless, downhearted, imbecilic, stodgy, gentle, beclouded, scatterbrained, softheaded, witty, uneconomical, influence, block out, cirrostratus, ordinary, prolix, inert, cut out, washed-out, lustreless, razor-sharp, mindless, bleak, loss-making, tristful, cloy, stale, out-of-date, half-witted, cloud, boneheaded, uneventful, sooty, weak-minded, stifle, not-for-profit, dusty, stuffy, nonprofit, inky, unvarying, dusky, shallow, edgeless, unresponsive, old, see, idiotic, pastel, insensate, bad, lacklustre, weighted, oafish, ancient, plain, angry, blue, jading, stock, bloodless, crippling, hazy, two-edged, poky, break, desolate, downcast, obscure, unprofitable, heavy, familiar, quick, uncomprehending, deliberate, quiescent, placid, witless, vague, dumb, impenetrable, lunkheaded, damp, matter-of-fact, thumping, hazed, unexciting, melancholy, worn-out, lead to, double-edged, column, billow, lumpy, weak, dimwitted, plodding, arid, repress, serrated, catch, off, dulled, hackneyed, stolid, razor-edged, scare, bonehead, become flat, jejune, flavorless, active, dunderheaded, ignorant, stir, drown, repetitious, deadly, earthbound, agonizing, shadowy, lamebrain, uneconomic, dark, depressed, scare away, knuckleheaded, used, die, cumulonimbus, deep

drabness, dapple-grayness, grayness, dullness, leadenness, iron-grayness, smokiness, mousiness, dinginess, dreariness, pearliness, somberness, ashiness, gloominess, silveriness

languorous, indolent, listless, lifeless, lackadaisical, drooping, phlegmatic, leisurely, slothful, tired, torpid, unhurried, languid, leaden, lazy, dopey, lumpish

fatigue, sedate, bore, annoy, tire, weary, tranquilize

cloddish, drowsy, benumbed, ponderous, sleepy, lethargic, bovine, doltish, sluggish, besotted, dense, loutish, slow, boorish, obtuse, thick-witted, blunt, apathetic, dim

unpointed, rounded, unsharpened, diminish, soften, pointless

gray, ashen, gun metal, pearly, pearl-gray, neutral-tint, dingy, mousy, salt-and-pepper, dapple-gray, battleship-gray, grizzled, smoky, gloomy, somber, lead-gray, silvery, taupe, drab, dreary, iron-gray, mole-gray

hamper, invalidate, deaden, tamper, disarm, hobble, benumb, neutralize, cripple, weaken, abrogate, hinder, botch, cramp, undermine, scotch, hamstring, vitiate, incapacitate, prostrate, handicap, sap, impair, anesthetize, enfeeble, disable, screw up, stun, paralyze, lame, stupefy

commonplace, uninteresting, humdrum, prosaic, insipid, monotonous, wearisome, tedious, mundane, tiresome, boring, depressing, dry

drugged, daze, dazed, narcotize, stupefied, desensitized, deadened, drug, narcotized, desensitize

faded, bleached, toneless, lackluster, pale, lusterless, colorless, neutral, hueless, achromatic, white

quiet, still, turn down, silence, muffle

insentient, unperceptive, soporific, numb, trance-like, dead, aloof, oblivious, faint, anesthetized, senseless, callous, insensible, blacked out, swooning, unconscious, unfeeling, comatose, stupid, narcotic, insensitive

muffled, flat, mute, non-resonant, silenced, damped

Usage examples:

• Thou, born of stern necessity, Dull peace! - "Minstrelsy of the Scottish border (3rd ed) (1 of 3)", Walter Scott.
• It has been a pleasure to talk to you, for the days are very long and very dull. - "The Squire's Daughter", Silas K(itto) Hocking.
• The book has not a dull line in it. - "Admiral Farragut", A. T. Mahan.