(informal) Eerie, or suggestive of ghosts or the supernatural. / (informal) Spooked; afraid; frightened. / (informal) Unpredictably excitable; skittish (used especially of horses).

The property of being spooky.

plural of spookiness

(US politics) A type of political action committee which does not have to reveal its donors' identities, and which does not limit the amount of contributions by donors.

plural of spooky PAC

(informal) Spooky.

(physics) Synonym of quantum entanglement