The Oxford Thesaurus An A-Z Dictionary of Synonyms - naughty adj.

1) mischievous, impish, puckish, roguish, scampish, devilish; frolicsome, playful: The children would get naughty the minute the teacher turned her back to the class. 2) disobedient, refractory, insubordinate, bad, perverse, wicked, fractious, unruly, wayward, unmanageable, ungovernable, undisciplined, defiant, obstreperous: Naughty pupils in this school are birched. 3) improper, offensive, vulgar, indecent, immoral, risqu‚, off colour, ribald, bawdy, blue, pornographic, smutty, lewd, obscene, dirty, Colloq X-rated, raunchy: The teacher caught Keith reading a naughty book.