Wordnet 3.0
ADVERB (1)
1. 
 in a disobedient or naughty way; 
- Example: "he behaved badly in school"- Example: "he mischievously looked for a chance to embarrass his sister"- Example: "behaved naughtily when they had guests and was sent to his room"[syn: badly, mischievously, naughtily]
The Collaborative International Dictionary of English v.0.48:
Naughtily \Naugh"ti*ly\, adv.
   In a naughty manner; wickedly; perversely. --Shak.
   [1913 Webster]
WordNet (r) 3.0 (2006):
naughtily
    adv 1: 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" [syn: badly,
           mischievously, naughtily]