1 (especially of a child) badly behaved; disobedient.
2 informal Mildly rude or indecent, typically because related to sex.
3 archaic Wicked.
Late Middle English: from naught + -y. The earliest recorded sense was ‘possessing nothing’; the sense ‘wicked’ also dates from late Middle English, and gave rise to the current senses.
I shall not be naughty today. I shall be a good boy. I shall not feature a word we’ve used before!
[In it’s too frequent smarty-pants manner, ODO’s word randomizer repeated erudite yet again. Since it was first officially employed here in 2006, it can only be included, though not featured here.]
An acquaintance also pointed out there was a potential lack of tea in the word’s meaning. This time, it wasn’t me, I promise!