adverb (r)

• in a disobedient or naughty way(adv.all)

  Example:
  Behaved naughtily when they had guests and was sent to his room.
  

  Synonym:
  badly, mischievously
  

  source: wordnet30
• In a naughty manner; wickedly; perversely.(adverb)

  source: webster1913