Halo teman! I think "jelek" could be accepted. Depending on the context, it would be translated as:

ugly; bad, evil; bad, poor in quality

Selamat belajar! :)

"jelek" = ugly.

"jelek" is shown as a possible translation because it can be used like that (in another sentence).
In this sentence, it's not a good translation.

"Kamu tidak jelek" = You are not ugly.