Etymology
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impish (adj.)

1650s, from imp + -ish. Related: Impishly; impishness.

updated on July 22, 2012

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Definitions of impish from WordNet

impish (adj.)
naughtily or annoyingly playful;
teasing and worrying with impish laughter
Synonyms: arch / implike / mischievous / pixilated / prankish / puckish / wicked
From wordnet.princeton.edu, not affiliated with etymonline.