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Adjective: roguish  row-gish
  1. Playful in an appealingly bold way
    "a roguish grin";
    - devilish, rascally
  2. Lacking principles or scruples
    "the captain was set adrift by his roguish crew";
    - rascally, scoundrelly, blackguardly

See also: dishonest, dishonorable [US], dishonourable [Brit, Cdn], ludic [formal], playful