2. Zero (usually a naught): All of the experts efforts to complete the project on time was for naught.
2. Used especially to describe a child who does not behave properly or does not obey a parent, teacher, etc.: The mother received a call from the principal of her daughter's school saying that the girl was naughty because she wouldn't quit talking while the teacher was trying to explain how to do arithmetic problems.
3. As a play on the word: a reference to anything with a zero, or zeros: Years that include zeros can be described as being naughty years; not because they behaved badly or were disobedient, but because they include "naughts or numbers with zeros".
2. Used to say or to suggest what should be done: Jane told her daughter, "You ought to get some rest now and then after that you ought to do your homework."
Someone has suggested that since zero means naught, then anyone who is born during a year that has zeros in it ought to be described as a naughty person (not with the meaning of "bad") because he/she was born in a year with a naught or naughts in its numerical composition; such as, 2001 or 2010; in other words, naughty years.
For aught I know, the more zeros in a year the naughtier the people are who were born in those years and the naughtiest, we must agree, ought to be those who came into existence in the year 2000 which has the most naughts.
2. Referring to a solid mass in a tree which is the result of the growth of a branch, creating a circular grain in the wood, as opposed to a straight grain when cut: The office was decorated with a panel of knotty pine wood.
A supervisor's secretary told her fellow worker, "Mr. Smith doesn't want to be disturbed. He says he's working on a naughty problem."
Her colleague replied with, "Hmmm, that sounds just like Mr. Smith."
Overhearing the conversation, the supervisor opened his door and responded with: "I said I was working on a knotty problem, not a naughty problem!"
The principal was faced with a knotty problem; that is, what to do about the two naughty youths who used spray paint on the knotty pine-board partition.