naughty

Mischievous; tending to misbehave or act badly (especially of a child).

Some naughty boys at school hid the teacher's lesson notes.

Sexually provocative; now in weakened sense, risqué, cheeky.

I bought some naughty lingerie for my honeymoon.

If I see you send another naughty email to your friends, you will be forbidden from using the computer!

Decadent, had as indulgence, especially an unhealthy one.

You knew I had to include at least one naughty chocolate smoothie, didn't you?!

Evil, wicked, morally reprehensible.

my proneſſe to ſinne, and naughty appetites and desires, woulde drawe me headlong to the pitte of hell

[…]How far that little candle throws his beams! So shines a good deed in a naughty world.

Bad, worthless, substandard.

In Cornwall is two speches, the one is naughty Englysshe, and the other is Cornysshe speche.

One basket had very good figs, even like the figs that are first ripe: and the other basket had very naughty figs, which could not be eaten, they were so bad.

To perform sexual acts.