scary
Definitions
Causing fear or alarm; frightening.
Easily frightened; timid.
Informal: causing intense anxiety or apprehension.
Examples
The abandoned house at the end of the street looked very scary at night.
It was a scary moment when the lights suddenly went out during the storm.
Synonyms
frightening terrifying spooky chilling alarming creepy intimidating
Antonyms
comforting reassuring calming soothing pleasant harmless inviting