a. 无赖的, 恶棍的, 不诚实的

ad. 无赖地

Rascally \Ras"cal*ly\ (r[a^]s"kal*l[y^]), a.
Like a rascal; trickish or dishonest; base; worthless; --
often in humorous disparagement, without implication of
dishonesty.

Our rascally porter is fallen fast asleep. --Swift.