naughty

Concise Oxford English Dictionary © 2008 Oxford University Press:
naughty/ˈnɔːti/

▶adjective (naughtier, naughtiest)

• 1 (especially of a child) disobedient; badly behaved.

• 2 informal mildly rude or indecent.

• 3 archaic wicked.

– derivatives
naughtily adverb,
naughtiness noun.

– origin ME: from naught + -y1.