roguish
[adjective]
Synonyms: dishonest, deceitful, knavish, lying, mendacious, shifty, unhonest, untruthful, playful, antic, impish, larkish, mischiefful, mischievous, prankful, prankish, pranky, wicked, coy, arch, coquettish

[TahlilGaran] English Synonym Dictionary ▲

rogu‧ish /ˈrəʊɡɪʃ $ ˈroʊ-/ adjective
someone with a roguish expression or smile looks amused, especially because they have done something slightly dishonest or wrong
—roguishly adverb

[TahlilGaran] Dictionary of Contemporary English ▲