spook·y
ˈspo͞okē
adjective informal
1.
sinister or ghostly in a way that causes fear and unease.
"I bet this place is really spooky late at night"
synonyms: eerie, sinister, ghostly, uncanny, weird, unearthly, mysterious; More
2.
NORTH AMERICAN
(of a person or animal) easily frightened; nervous.