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Webster 1913 Edition

Adj.

[L.

caliginosus

; cf. F.

caligineux

Affected with darkness or dimness; dark; obscure.

[R.]

Blount.

–

Ca-lig′i-nous-ly

adv.

–

Ca-lig′i-nous-ness

Noun.

Adj.

Dim; obscure; dark.

caliginous ‎(comparative more caliginous, superlative most caliginous)

Dark, obscure; murky.
- 1982, TC Boyle, Water Music, Penguin 2006, p. 155:
  Inside the atmosphere was rank and caliginous: fumes rose from puddles, groans sifted through the shadows.