roguish

(s) playful in an appealingly bold way
- a roguish grin
rascally, devilish,
(s) lacking principles or scruples
- the rascally rabble
- the tyranny of a scoundrelly aristocracy" - W.M. Thackaray
- the captain was set adrift by his roguish crew
blackguardly, scoundrelly, rascally,

rascally devilish blackguardly scoundrelly

roguishly roguishness