Superlative form of naughty: most naughty.; most naughty.(adjective)
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Use "naughtiest" in a sentence
"Had I been so naughty that I had called the naughtiest girl in the whole county out to me?"
"A new pre-Christmas CNN poll asked respondents which politician has been the "naughtiest" this year, from among three choices and with their offenses listed."
"Video: Volvo crowns Paris 'naughtiest' city in Europe as part of experiments tied to bizarre"