Etymology
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shifty (adj.)

1560s, "able to manage for oneself, fertile in expedients," from shift (n.1) in secondary sense of "dodge, trick, artifice" + -y (2). Meaning "habitually using dishonest methods, characterized by trickery" first recorded 1837. In a sense "prone to shifting," of the wind, used from 1884. Related: Shiftily; shiftiness.

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Definitions of shifty

shifty (adj.)
characterized by insincerity or deceit; evasive;
shifty eyes
Synonyms: devious
shifty (adj.)
changing position or direction;
shifty winds
Synonyms: shifting
From wordnet.princeton.edu