glooming

v. act depressed, be gloomy, be sad; become dark, become dim

Adjective
1. depressingly dark; "the gloomy forest"; "the glooming interior of an old inn"; "`gloomful' is archaic"
(synonym) gloomy, gloomful
(similar) dark

(p. pr. & vb. n.)
of Gloom
  

(n.)
Twilight (of morning or evening); the gloaming.
  

OSCURANDO. ESSENDO CUPO. RATTRISTANDO