Wily implies a cleverness used for trickery or deception. The wily con artist fooled everyone with his scheme.
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Negative Connotation
Although 'wily' involves cleverness, it often has a negative connotation, suggesting dishonesty. He had a reputation as a wily businessman with dubious ethics.
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Nuanced Usage
'Wily' can be used admiringly for resourcefulness, even if the methods are questionable. She admired her grandmother's wily way of solving problems.