Etymology
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scary (adj.)

also scarey, "terrifying, causing or tending to cause fright," 1580s, from scare (n.) + -y (2). Meaning "easily frightened, subject to scares" is from 1800. In this sense formerly sometimes colloquially as skeery, skeary; OED marks this meaning as originally and chiefly North American. Related: Scarier; scariest.

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Definitions of scary

scary (adj.)
provoking fear terror;
a scary movie
Synonyms: chilling / shivery / shuddery
From wordnet.princeton.edu