Causing a feeling of fear or unease; eerie. The abandoned house at the end of the street had a spooky atmosphere that made everyone avoid it at night.
Resembling or characteristic of a ghost; ghostly. The fog created a spooky silhouette of the trees, making them look like ghostly figures in the night.
Strange and frightening; uncanny. There was a spooky coincidence when both sisters wore the exact same outfit without planning it.
Informal: Relating to espionage or spies; covert. The military planned several spooky operations behind enemy lines.