Etymology
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knavish (adj.)

late 14c., "low, vulgar," from knave + -ish. Meaning "rascally" is from late 15c. (implied in knavishly). Related: Knavishness.

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Definitions of knavish

knavish (adj.)
marked by skill in deception;
Synonyms: crafty / cunning / dodgy / foxy / guileful / slick / sly / tricksy / tricky / wily
From wordnet.princeton.edu