dim

1 being without light or without much light a dim room in the basement that is very depressing Synonyms black, caliginous, darkened, darkish, darkling, darksome, dark, dimmed, dusk, dusky, gloomy, lightless, murky, obscure, obscured, pitch-black, pitch-dark, pitchy, rayless, somber (or sombre), stygian, tenebrific, tenebrous, unlitRelated Words crepuscular, twilit; moonless, starless, sunless; cloudy, dull, dulled, lackluster; shadowlike, shadowy, shady; gray (also grey), leaden, pale; beclouded, befogged, clouded, foggy, fuliginous, misty, smoggy, soupyNear Antonyms ablaze, agleam, aglitter, alight, beaming, beamy, effulgent, glaring, glowing, incandescent, lambent, radiant, relucent, resplendent, shining, sparkling; ultrabright; glossy, lustrous, shiny; floodlit (also floodlighted), highlighted, spotlighted (or spotlit); moonlit, moony, starlit, sunlitAntonyms bright, brightened, brilliant, illuminated, illumined, light, lit (or lighted), lightsome, lucent, lucid, luminous

2 lacking a surface luster or gloss over time, exposure to ultraviolet light will make bright pigments turn dim Synonyms matte, dull, dulled, flat, lusterlessRelated Words tarnished, unpolished; cloudy, dingy, dirty, drab, lackluster, mousy (or mousey), muddy; gray (also grey), leaden, pale, palish; black, dark, darkened, darkish, dimmed, dusky, gloomy, murky, obscure, obscured, pitch-black, pitch-dark, somber (or sombre), stygian, tenebrific, tenebrousNear Antonyms buffed, burnished, glazed, lacquered, polished, rubbed, shellacked, varnished; satin, satiny; silken, silky; slick, slippery; gemmy, gleaming, glimmering, glinting, glistening, glittering, scintillating, shimmering, shining, sparkling, twinkling; beaming, bedazzling, bright, brightened, brilliant, candescent, dazzling, effulgent, fulgent, glowing, incandescent, lambent, lucent, lucid, luminous, radiant, refulgent, resplendent, shiningAntonyms glossy, lustrous, shiny, sleek

3 not seen or understood clearly have only a dim knowledge of the subject Synonyms blear, bleary, blurry, faint, foggy, fuzzy, gauzy, hazy, indefinite, indistinct, indistinguishable, misty, murky, nebulous, obscure, opaque, pale, shadowy, unclear, undefined, undetermined, vagueRelated Words dark, dusky, gloomy; impalpable, inappreciable, intangible, invisible; hieroglyphic (also hieroglyphical), incomprehensible, indecipherable, indiscernible, inexplicable, mysterious, obfuscatory, puzzlingNear Antonyms bright, distinct, evident, obvious, plain; certain, firm, strong, sureAntonyms clear, definite, pellucid

4 not having or showing an ability to absorb ideas readily she's kind of dim, but really sweet Synonyms airheaded, birdbrained, bonehead, boneheaded, brain-dead, brainless, bubbleheaded, chuckleheaded, dense, stupid, dim-witted, doltish, dopey (also dopy), dorky [slang], dull, dumb, dunderheaded, empty-headed, fatuous, gormless [chiefly British], half-witted, knuckleheaded, lamebrain (or lamebrained), lunkheaded, mindless, oafish, obtuse, opaque, pinheaded, senseless, simple, slow, slow-witted, soft, softheaded, thick, thickheaded, thick-witted, unintelligent, unsmart, vacuous, weak-minded, witlessRelated Words cretinous, feebleminded, simpleminded; boobish, foolish, idiotic (also idiotical), imbecile (or imbecilic), moronic; ignorant, illiterate, lowbrow, uneducated, uninformed, unintellectual, untaught, unthinking; absurd, asinine, balmy, cockeyed, crackpot, crazy, cuckoo, daffy, daft, dippy, dotty, featherheaded, fool, half-baked, harebrained, insane, kooky (also kookie), loony (also looney), lunatic, mad, nonsensical, nutty, preposterous, sappy, screwball, silly, tomfool, unwise, wacky (also whacky), zany; fallacious, illogical, invalid, irrational, unreasonableNear Antonyms ingenious, resourceful; acute, astute, discerning, insightful, keen, knowing, perceptive, percipient, perspicacious, sagacious, sage, sapient, savvy, wise; cerebral, erudite, highbrow, intellectual, knowledgeable, learned, literate, scholarly, thinking, well-read; educated, informed, schooled, skilled, trained; crafty, cunning, foxy, shrewd, wily; judicious, prudent, sane, sensible, sound; logical, rational, reasonable, validAntonyms apt, brainy, bright, brilliant, clever, fast, hyperintelligent, intelligent, keen, nimble, quick, quick-witted, sharp, sharp-witted, smart, supersmart, ultrasmart