Etymology
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thievish (adj.)

mid-15c., "of or pertaining to thieves," from thieve or thief + -ish. Meaning "inclined to steal" is from 1530s. Wyclif and Chaucer used thiefly (late 14c.). Related: Thievishly; thievishness.

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Definitions of thievish

thievish (adj.)
given to thievery;
Synonyms: thieving
From wordnet.princeton.edu