Weird or 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 "Awesome" , "Uncannily strange" , "Spine-tingling" , "spine-chilling" , "Spooky, weird" .)