RichThesaurus
double-dealing
vs
sly as a fox
double-dealing
adj
Cheating, dishonest; treacherous.
noun
deceit or treachery
sly as a fox
adj
Very sly, very cunning.
How often have the words
double-dealing
and
sly as a fox
occurred in a corpus of books?
(source:
Google Ngram Viewer
)