ὃ σὺ μισεῖς ἑτέρῳ μὴ ποιήσεις → don't do to others what you don't want them to do to you
adj.
Of birth: P. and V. ταπεινός, φαῦλος, κακός, Ar. and P. ἀγεννής, Ar. and V. δυσγενής, V. ἀγέννητος.
Harsh: P. and V. πικρός, τραχύς, ἀγνώμων, βαρύς; see harsh.
