guileful

Mane (Îngilîzî)

Full of guile; treacherously deceptive.

Hevwate

cunning

crafty

wily

treacherous

sly

perfidious

insidious

tricksy

foxy

slick

snaky

tricky

dodgy

shrewd

deceitful

knavish

trappy

conniving

crooked

designing

dishonest

fraudulent

lurking

serpentine

underhand

underhanded

vulpine

two faced

artful

Werger

astuto

astucieux

perfide

traiçoeiro

infidus

pérfido

rusé

listig

tückisch

heimtückisch

sleale

ماكر

arglistig

perfido

Etîmolojî (Îngilîzî)

Ji Middle English mîras hatiye girtin: gileful

In summary

From Middle English gileful, gilful, equivalent to guile + -ful.