Weird, spooky (5)
I believe the answer is:
eerie
I believe this is a double definition.
'weird' is the first definition.
(both can mean strange or unsettling)
'spooky' is the second definition.
(synonyms)
(Other definitions for eerie that I've seen before include "Scary, weird" , "Mysterious" , "Frighteningly odd" , "Weird, uncanny" , "Spine-tingling" .)