roguish
1. [ adjective ] playful in an appealingly bold way
Synonyms: rascally devilish
Examples:

"a roguish grin"

Related terms: playful
2. [ adjective ] lacking principles or scruples
Synonyms: scoundrelly blackguardly rascally
Examples:

"the rascally rabble" "the tyranny of a scoundrelly aristocracy" - W.M. Thackaray "the captain was set adrift by his roguish crew"

Related terms: dishonest
Similar spelling:   roughish
  roughage