Creepy Adjectives:
General Creepy:
* Eerie
* Unnerving
* Sinister
* Ominous
* Uneasy
* Ghastly
* Haunting
* Gloomy
* Disturbing
* Morbid
* Unsettling
* Unholy
* Macabre
* Spooky
* Chilling
* Bone-chilling
* Bloodcurdling
Physical Creepy:
* Rotting
* Putrid
* Stale
* Festering
* Putrefying
* Gnarled
* Twisted
* Deformed
* Withered
* Emaciated
* Hollow-eyed
* Bloodshot
* Pale
* Ashen
* Cold
Behavioral Creepy:
* Malicious
* Malevolent
* Insidious
* Devious
* Cunning
* Calculating
* Psychotic
* Sadistic
* Obsessive
* Fanatical
* Unhinged
* Deranged
* Twisted
Sensory Creepy:
* Whispering
* Screeching
* Shrieking
* Moaning
* Groaning
* Hissing
* Rustling
* Squeaking
* Dripping
* Stagnant
* Musty
* Foul
* Putrid
Metaphorical Creepy:
* Unnatural
* Forbidden
* Prohibited
* Profane
* Uncanny
* Surreal
* Abhorrent
* Repugnant
* Monstrous
* Demonic
Bonus:
* Creepy crawly: This one isn't exactly an adjective, but it's a phrase that evokes a sense of crawling, squirming creepiness.
Note: The "creepiness" of these adjectives can vary depending on the context and the individual's perception.