Definition of "sly"
adjective:
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Artfully cunning; secretly mischievous; wily.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Dexterous in performing an action, so as to escape notice; nimble; skillful; cautious; shrewd; knowing; — in a good sense.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Done with, and marked by, artful and dexterous secrecy; subtle; as, a sly trick.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Light or delicate; slight; thin.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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adverb: