1. (a.) Destitute, or partially destitute, of light; not receiving, reflecting, or radiating light; wholly or partially black, or of some deep shade of color; not light-colored; as, a dark room; a dark day; dark cloth; dark paint; a dark complexion.
2. (a.) Not clear to the understanding; not easily seen through; obscure; mysterious; hidden.
3. (a.) Destitute of knowledge and culture; in moral or intellectual darkness; unrefined; ignorant.
4. (a.) Evincing black or foul traits of character; vile; wicked; atrocious; as, a dark villain; a dark deed.
5. (a.) Foreboding evil; gloomy; jealous; suspicious.
6. (a.) Deprived of sight; blind.
7. (n.) Absence of light; darkness; obscurity; a place where there is little or no light.
8. (n.) The condition of ignorance; gloom; secrecy.
9. (n.) A dark shade or dark passage in a painting, engraving, or the like; as, the light and darks are well contrasted.
10. (v. t.) To darken to obscure.
Thesaurus Entries
Egyptian darkness, Erebus, Gothicism, Stygian, ableptical, abominable, abstruse, adiaphanous, age of ignorance, amaurotic, amoral, amorphous, amorphousness, apocalyptic, arcane, arrant, atramentous, atrocious, bad, baleful, baneful, barbarism, base, beamless, beetle-browed, benighted, benightedness, benightment, bereft of light, black, black as coal, black as ebony, black as ink, black as midnight, black as night, black-browed, black-skinned, blackish, blackness, blamable, blameworthy, bleak, blear, bleared, bleary, blind, blurred, blurry, bodeful, boding, brown, brunet, cabalistic, caliginous, castellatus, censored, cheerless, cirrose, cirrous, classified, clear as mud, close, closed, closemouthed, cloud-flecked, clouded, cloudy, coal-black, coaly, color-blind, colored, complicated, concealed, confused, conscienceless, corrupt, corrupted, criminal, crooked, cryptic, cumuliform, cumulous, damnable, dark age, dark as night, dark as pitch, dark-colored, dark-complexioned, dark-skinned, darkish, darkling, darkness, darkness visible, darksome, dead of night, deep, deep black, dejected, devilish, devious, dim, dim-sighted, dire, dirty, discreet, disgraceful, dishonest, dishonorable, dismal, doleful, doomful, doubtful, dour, drab, drear, drearisome, dreary, dubious, dull, dumpish, dun, dusk, dusky, ebon, ebony, eclipsed, enigmatic, esoteric, evasive, evil, evil-starred, execrable, eyeless, faint, fateful, feeble, felonious, filmy, fishy, flagitious, flagrant, fog, fogginess, foggy, foreboding, foul, fraudulent, frowning, funebrial, funereal, fuzziness, fuzzy, gloom, gloominess, gloomy, glowering, glum, grave, gray, grim, grum, grumly, half-seen, half-visible, hazy, heathenism, heavy, heinous, hellish, hemeralopic, hermetic, hidden, hush-hush, ignorance, ignorant, ill, ill-boding, ill-defined, ill-fated, ill-got, ill-gotten, ill-lighted, ill-lit, ill-omened, ill-starred, immoral, impenetrable, impervious to light, improper, in darkness, in the dark, inauspicious, incomprehensible, inconspicuous, indefinite, indeterminate, indeterminateness, indirect, indistinct, indistinctness, indistinguishable, infamous, iniquitous, ink-black, inky, insidious, intense darkness, intransparent, intricate, jetty, joyless, knavish, knotty, latent, lenticularis, lightlessness, low, low-profile, lowering, mammatus, melancholy, melanian, melanic, melanistic, melano, melanotic, melanous, menacing, merely glimpsed, midnight, mind-blind, mist, mistiness, misty, monstrous, moodish, moody, moonlessness, mopey, moping, mopish, morose, mournful, muddy, mumbo jumbo, mumpish, murk, murkiness, murky, mysterious, mystic, mystical, mystification, mystifying
