the Coptic language is a dead language
only used for prayers in the Coptic church
almost all books written in Coptic are related to religious in a way or another (Christianity, gnostic or magic)
So as you may have guessed already those books doesn't include curses (in the way you mean)
expect of course words like stupid, ugly, ... (which you can find them easily in any dictionary)
sorry if that wasn't very helpful to you