Answer: crepuscular

AnswerCrossword Clue
CREPUSCULAROf twilight.
crepuscularrelating to twilight also CREPUSCULOUS
crepuscularof, relating to, or resembling twilight; dim.
crepuscularappearing or active in the twilight, as certain bats and insects
crepuscularof, pertaining to, or resembling twilight; dim; indistinct
crepuscularpertaining to twilight.