Synonyms of sly in English:

sly

adjective

noun

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Phrases

on the sly

is she meeting some other guy on the sly?
[Antonyms] openly
in secretsecretlyfurtivelystealthilysneakilyslylysurreptitiouslycovertlyclandestinelyon the quieton the sidebehind someone's backunder coverunder the counter informalon the q.t.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody