naughtiest

adjective

1. Mischievous; tending to misbehave or act badly (especially of a child).“Some naughty boys at school hid the teacher's lesson notes.”
2. Sexually provocative; now in weakened sense, risqué, cheeky.“I bought some naughty lingerie for my honeymoon.”
3. Evil, wicked, morally reprehensible.
4. Bad, worthless, substandard.