dimness, gloom

DARKNESS
WordClue
DUSKdarkness, obscurity
GLOOMDarkness, dimness or obscurity
HEART... of Darkness (Conrad)
SHADEdarkness, murkiness
DIMNESSdarkness, gloom
OPACITYobscurity, dimness
MURKINESSdarkness, dimness
NIGHTFALLdarkness, dusk
OBSCURITYopacity, dimness
PESSIMISMgloom
DECLINEdiminution, phthisis
COINdinar or ducat