naughtily
Adverb
Meaning
In a naughty manner; wickedly; perversely.
Source: Webster's dictionarySynonyms
badly
mischievously
ill
poorly
improperly
acutely
carelessly
criminally
awfully
clumsily
dreadfully
deplorably
wickedly
indecently
seriously
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Antonyms
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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