Fast darkening Synonyms

Definitions for Fast


  • (adjective) moving, proceeding, or acting with great speed
  • (adjective) firm in one's allegiance to someone or something
  • (adjective) firmly positioned in place and difficult to dislodge

Synonyms for phrase

FD abbreviation

FD is an abbreviation for Fast Darkening
What does FD stand for?
FD stands for "Fast Darkening"

Darkening replaced

Definitions for Darkening


  • (adjective) causing or marked by an atmosphere lacking in cheer
  • (noun) changing to a darker color
  • (adjective) becoming dark or darker as from waning light or clouding over