As an adverb slily is
.
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Not English
Wikidiffcom has no English definition. It may be misspelled. slily
English
Adverb
(
en adverb)
* 1851 , Herman Melville, Moby-Dick
- So when they were working that evening at the pumps, there was on this head no small gamesomeness slily going on among them, as they stood with their feet continually overflowed by the rippling clear water
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