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spooky

[spoo-kee]
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adjective, spook·i·er, spook·i·est. Informal.
  1. like or befitting a spook or ghost; suggestive of spooks.
  2. eerie; scary.
  3. (especially of horses) nervous; skittish.
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Origin of spooky

An Americanism dating back to 1850–55; spook + -y1
Related formsspook·i·ly, adverbspook·i·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for spookiness

spooky

adjective spookier or spookiest informal
  1. ghostly or eeriea spooky house
  2. resembling or appropriate to a ghost
  3. US easily frightened; highly strung
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Derived Formsspookily, adverbspookiness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for spookiness

spooky

adj.

1854, "frightening;" 1926, "easily frightened," from spook (v.) + -y (2). Related: Spookily; spookiness.

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Online Etymology Dictionary, © 2010 Douglas Harper