Dull1. (superl.) Slow of understanding; wanting readiness of apprehension; stupid; doltish; blockish.
2. (superl.) Slow in action; sluggish; unready; awkward.
3. (superl.) Insensible; unfeeling.
4. (superl.) Not keen in edge or point; lacking sharpness; blunt.
5. (superl.) 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.
6. (superl.) Heavy; gross; cloggy; insensible; spiritless; lifeless; inert.
7. (superl.) 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.
8. (v. t.) To deprive of sharpness of edge or point.
9. (v. t.) To make dull, stupid, or sluggish; to stupefy, as the senses, the feelings, the perceptions, and the like.
10. (v. t.) To render dim or obscure; to sully; to tarnish.
11. (v. t.) To deprive of liveliness or activity; to render heavy; to make inert; to depress; to weary; to sadden.
12. (v. i.) To become dull or stupid.
Thesaurus Entries
KO, Laodicean, Olympian, Quaker-colored, Spartan, abate, abeyant, abrupt, achromatic, achromatize, achromic, acier, affectless, allay, alleviate, aloof, anemic, anesthetic, anesthetize, anesthetized, apathetic, appease, arctic, arid, ascetic, ashen, ashy, asleep, assuage, asthenic, attemper, attenuate, austere, autistic, backward, bad, baffle, bald, banausic, bank the fire, bare, barren, bate, bated, becloud, bedaze, bedim, beef-witted, befog, benumb, benumbed, besot, betwixt and between, blah, blanch, blank, blase, bleach, blear, blear-witted, bled white, blind, bloodless, blue, bluff, blunt, blunt-edged, blunt-ended, blunt-pointed, blunt-witted, blunted, bluntish, blur, blurry, bored, boring, bovine, brainless, broken-record, bromidic, cadaverous, callous, candid, canescent, cast down, cataleptic, catatonic, characterless, chasten, chicken, chill, chilly, chloranemic, chloroform, cinereous, cinerous, cloddish, cloud, clouded, cloudy, cold, cold as charity, cold-blooded, coldcock, coldhearted, colorless, comatose, common, commonplace, constrain, control, cool, cowardly, cramp, crass, cripple, cushion, damp, damped, dampen, dampened, dapple, dapple-gray, dappled, dappled-gray, dark, darken, de-emphasize, dead, deaden, deaden the pain, deadened, deadly pale, deafen, deathly pale, debilitate, debilitated, decolor, decolorize, dejected, dense, depressed, depressing, desensitize, desensitized, detached, devitalize, dim, dim-witted, diminish, dimmed, dingy, direct, discolor, discolored, disedge, disinterested, dismal, dispassionate, dispirited, doltish, dope, dopey, dormant, dove-colored, dove-gray, down, downhearted, downplay, drab, draggy, drain, drain of color, draw the teeth, drearisome, dreary, drooping, droopy, drug, drugged, dry, dryasdust, dull of mind, dull-edged, dull-headed, dull-pated, dull-pointed, dull-witted, dulled, dullish, dumb, dun, duncical, dusty, earthbound, ease, ease matters, edgeless, effete, elephantine, emotionally dead, emotionless, empty, enervate, enervated, enfeeble, etherize, etiolate, etiolated, even-tempered, everlasting, eviscerate, exanimate, exhaust, exhausting, exsanguinated, exsanguine, exsanguineous, extenuate, fade, faded, fagging, faint, faintish, fair, fair to middling, faired, fairish, fallow, fat-witted, fatiguing, feeble, feebleminded, flabby, flaccid, flat, floppy, foment, foul, frank, freeze, frigid, frosted, frosty, frozen, fume, ghastly, give relief, glaucescent, glaucous, gloomy, gone, gray, gray-black