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Definition of slyly : In a sly manner; shrewdly; craftily.

Synonyms:

meanly, cutely, stealthily, on the quiet, secretly, with downcast eyes, disingenuously, furtively, knavishly

schemingly, calculatingly, smoothly, skillfully, slickly, snakily, deviously, masterfully, warily

cleverly, wittily, adroitly, brilliantly, subtly, foxily, inventively, craftily, sharply, deftly, shrewdly, cannily, ingeniously, comically, artfully, quickly, intelligently, sarcastically, scurrilously, sophisticatedly, resourcefully, cunningly, trickily, astutely, drolly, urbanely

instinctively, intuitively

Usage examples:

• That they were only memories, these thoughts that rose up to slyly capture his attention, was clear. - "The Short Life", Francis Donovan.
• " Perhaps it's as well," said Joyce slyly. - "Martin Pippin in the Apple Orchard", Eleanor Farjeon.
• It's news that- that's been mighty slyly kept by a gentleman here present. - "Chippinge Borough", Stanley J. Weyman.