Answer: sliest

AnswerCrossword Clue
SLIESTHardest to outwit
SLIESTMost roguish.
SLIESTShrewdest.
SLIESTWiliest
SLIESTMost tricky
SLIESTMost wily
SLIESTMost foxy
SLIESTMost clever
SLIESTMaximally cunning
SLIESTLike the best ruse
SLIESTLike the fox among all beasts
SLIESTLike the chief fox
SLIESTMost conniving.
SLIESTLeast straightforward
SLIESTMost furtive
SLIESTCrafty to the max
SLIESTTops in cunning
SLIESTThe most conniving
SLIESTMost cagey
SLIESTMost canny
sliestcunning
slieststealthy
sliestSLY, crafty (skillful in deceiving)
SLIESTMost dodgy
SLIESTMost foxlike
SLIESTFoxiest
SLIESTMost conniving
SLIESTMost cunning
SLIESTMost crafty
SLIESTLeast candid
SLIESTMost artful
SLIESTMost devious
SLIESTSuperlatively foxy
SLIESTSuperlatively surreptitious
SLIESTMost underhanded
SLIESTMost roguish
SLIESTLeast honest
SLIESTArtful to the max
SLIESTMost guileful
SLIESTLeast forthright