Informal Suggestive of ghosts or a ghost; eerie.(adjective)
Informal Easily startled; skittish.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "spooky" in a sentence
"It is only two lines long, but its melody, in spooky mode IV, is filled with undulations which remind one of the journey of the Magi."
"Kim sez, "Teardrop Memories is an online store specializing in spooky and arcane antiquities, from funeral cards to embalming supplies, church benches to cribs for dead infants to ... salad forks that advertise a Philly mortuary?""
"Oh and I’ll let in spooky, exciting and adventurous too."