1. [ adjective ] becoming dark or darker as from waning light or clouding over

"the darkening sky"

Related terms: dark
2. [ adjective ] characterized by hopelessness; filled with gloom
Synonyms: gloomy grim

"gloomy at the thought of what he had to face" "gloomy predictions" "a gloomy silence" "took a grim view of the economy" "the darkening mood"

Related terms: hopeless
3. [ noun ] (color) changing to a darker color
Synonyms: blackening
Related terms: change_of_color obfuscation darken
Similar spelling:   darken