Etymology
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slyness (n.)

mid-14c., from sly (adj.) + -ness.

updated on October 13, 2013

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Definitions of slyness from WordNet

slyness (n.)
shrewdness as demonstrated by being skilled in deception;
Synonyms: craft / craftiness / cunning / foxiness / guile / wiliness
From wordnet.princeton.edu, not affiliated with etymonline.