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English definition of “sly”

sly

adjective    /slɑɪ/ (comparative slyer, superlative slyest)
not letting others know true opinions or intentions , or dishonest : She thought that by being sly, she could fool people . A cat can be a very sly animal . slyly    /ˈslɑɪ·li/ adverb He winked slyly and lowered his voice , as if he had some secret to reveal .
(Definition of sly adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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