Princeton's WordNet

1. badly, mischievously, naughtily(adverb)

   in a disobedient or naughty way

   "he behaved badly in school"; "he mischievously looked for a chance to embarrass his sister"; "behaved naughtily when they had guests and was sent to his room"

Wiktionary

1. naughtily(Adverb)

   In a naughty manner.

Webster Dictionary

1. Naughtily(adverb)

   in a naughty manner; wickedly; perversely

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