Ⲧⲁⲙⲉⲛⲣⲓⲧ Ⲙⲓⲣⲛⲁ,
I cannot agree more with both admin and Ⲡⲓⲙⲟⲩⲓ. Unfortunately, Dr Nabil is mistaken. Ⲣⲉⲙ is a prefix referring to man (masculine and feminine of course) and many people mistake it as a generic genitive term. It is not.
I therefore suggest ⲕⲟⲥⲙⲓⲕⲟⲛ a word extensively used in Coptic resources and even in the Old Testament.
However, if you would like to keep it very Coptic (even though ⲕⲟⲥⲙⲓⲕⲟⲛ is not Greek only) you could say something like ⲛⲁ (ⲫⲁ, ⲑⲁ) ⲡⲕⲁϩⲓ which again at least in the Bible refers to "worldly" or ⲛⲁ (ⲫⲁ, ⲑⲁ) ⲡⲓⲑⲟ which strictly speaking is not exactly the same but similar.. I hope this helps..
Ⲟⲩϫⲁⲓ ϧⲉⲛ ⲡϭⲥ