adj. 25B6; adjective
a roguish character : UNPRINCIPLED, dishonest, deceitful, unscrupulous, untrustworthy, shameless; wicked, villainous; informal shady, scoundrelly, rascally; archaic knavish.
a roguish grin : MISCHIEVOUS, playful, teasing, cheeky, naughty, wicked, impish, devilish, arch; informal waggish.