Use 'dusky' to describe a place with low light that creates a cozy or intimate feeling. The candlelit dinner had a dusky charm.
Pro Tip 2/3
Not Pitch-Black
'Dusky' implies some light is present, unlike 'dark', which can mean no light at all. As twilight set in, the sky turned a dusky blue.
Pro Tip 3/3
Subdued Lighting
'Dusky' often suggests a natural or gentle decrease in light, rather than abrupt darkness. We watched as the landscape turned dusky with the setting sun.