spooky

ambient

mysterious

ominous

foreboding

eerie

suspenseful

somber

worried

uneasy

dreamy

slow

creepy

ghostly

unknown

strange

gloomy

sinister

trepidation

brooding

cautious

cold

dark

disturbed

doubtful

haunting

hesitant

loom

lurk

menacing

moody

nervous

solemn

surreal

taut

tentative

uncertain

acoustic piano

synthesizer