It describes a person or their behavior, like:
* "The naughty child spilled juice all over the floor."
* "He got into trouble for his naughty behavior."
However, in some informal contexts, "naughty" can be used as a noun. It usually refers to something mischievous or playfully immoral:
* "They were up to all sorts of naughty."
* "That's a bit of a naughty thought, isn't it?"
It's important to note that using "naughty" as a noun is less common and usually used in a lighthearted or humorous context.