Something (usually, face expression) that is dreary, mournful, bleak and gloomy is also called...
transfixing
lugubrious
tremendous
anticlimactic
Subtly charming in an innocent way.
tenacious
elusive
winsome
seraphic
This adjective is great to describe shadowy and obscure surroundings a moody scene.
oneiric
tenebrous
floaty
dazzling
Whispering or rustling softly (e.g. leaves, water, wind)
enigmatic
magnetic
susurrant
misty
A remark / comment / humour that is sharply sarcastic is...
jubilant
vivacious
cerebral
mordant
An adjective that relates to light and dark contrast is...
vigilant
chiaroscuro
stalwart
vivid
A brooding, dark expression is...
saturnine
robust
lush
verdant
Able to change form easily; adaptable and elusive.
Abysmal
Protean
Intricate
Convalescent
Something that is cold and dark, tomb-like evoking dread or solemnity is...
alkaline
chrystalline
choral
sepulchral
Smoothly charming.
amorphous
unflappable
mercurial
suave
Transparently clear, either literally or metaphorically
Pellucid
Oblique
Effervescent
Murmurous
Sticky or clingy - both physically and emotionally
gleaming
guttural
viscid
stridulant
Detached, drifting, without anchor - physically or emotionally
unmoored
liminal
diaphanous
clandestine
Tall, slender and graceful in motion.
willowy
indomitable
assertive
lissom