caliginous

adj

1. (archaic, literary)Dark, obscure; murky.

   “Hierapolis is ſeated over-againſt Laodicea, where are to be ſeen baths of hot waters, and the Plutonium. [...] The Plutonium is under the brow of the hill, the entrance into which is no wider than that a man can thruſt himſelf through; yet it is very deep within, of a quadrangular form, containing about the compaſs of half an acre, and is filled with ſuch a thick and caliginous air, that the ground cannot be ſeen.”

   “By the time breakfast was announced, the land had faded into a thin caliginous streak; and, except passing a huge unwieldy Chinese junk, which lay at anchor, though her lateen sails were hoisted, nothing worthy of note occurred during the day.”

   “Inside the atmosphere was rank and caliginous: fumes rose from puddles, groans sifted through the shadows.”

   “They say the darkest hour is just before the dawn, and caliginous thoughts often swirled through his murky, insomniac mind as he lay awake [...]”