roguish

Adjective

• 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
    

• playful in an appealingly bold way
  • a roguish grin
    

Related words

• Synonyms: 
  rascally , scoundrelly , blackguardly , devilish