Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

   NOUN:DARKNESS &c. adj.; tenebrosity, umbrageousness, dunness [rare], caliginousness, lightlessness, sootiness; blackness (dark color) [See Blackness]; obscurity, gloom, murk or mirk, murkiness or mirkiness, darksomeness; dusk (dimness) [See Dimness].
  Cimmerian -, Stygian -, Egyptian- darkness; night; midnight; dead of -, witching hour of -, witching time of- night; darkness visible; “darkness which may be felt” [Bible]; “the palpable obscure” [Milton]; “embalméd darkness” [Keats]; Erebus; “the jaws of darkness” [M. N. D.]; “sable-vested Night” [Milton].
  SHADOW, shade, umbra, penumbra; skiagraphy or sciagraphy; skiagram or sciagram, skiagraph or sciagraph; radiograph.
  OBSCURATION; obumbration [rare]; obtenebration [rare], offuscation [obs.], caligation [obs.], adumbration; extinction; eclipse, total eclipse; gathering of the clouds.
  SHADING; distribution of shade; chiar-oscuro [It.] (light) [See Light].
   VERB:BE DARK &c. adj.; be in darkness &c. n.
  DARKEN, obscure, shade; dim; tone down, lower; overcast, overshadow; cloud, cloud over, darken over, murk or mirk; eclipse; offuscate [obs.], obumbrate, obtenebrate [rare], obfuscate; adumbrate; cast into the shade; becloud, bedim, bedarken; cast -, throw -, spread- a -shade, – shadow, – gloom; “walk in darkness and in the shadow of death” [Book of Common Prayer].
  EXTINGUISH, put out, blow out, snuff out, dout [obs. or dial. Eng.]
   ADJECTIVE:DARK, darksome, darkling; obscure, tenebrious, tenebrous, sombrous, pitch dark, pitchy; caliginous [archaic]; black (in color) [See Blackness].
  dark as -pitch, – the pit, – Erebus.
  SUNLESS, lightless &c. (see sun, light, [See Luminary]); somber, dusky; unilluminated &c. (see illuminate [See Light]); nocturnal; dingy, lurid, gloomy; murky or mirky, murksome or mirksome, sooty, shady, umbrageous; overcast (dim) [See Dimness]; cloudy (opaque) [See Opacity]; darkened &c. v.
  BENIGHTED; noctivagant, noctivagous.
   ADVERB:in the -dark, – shade; at night, by night, through the night; darkling, darklings [rare].
  1. In the dead vast and middle of the night.—Hamlet
  2. Brief as the lightning in the collied night.—Midsummer Night’s Dream
  3. Eldest Night and Chaos, ancestors of Nature.—Paradise Lost
  4. Empress of silence, and the queen of sleep.—Marlowe
  5. Who could have thought such darkness lay concealed Within thy beams, O Sun.—J. Blanco White
  6. The blackness of the noonday night.—Longfellow
  7. The prayer of Ajax was for light.—Longfellow