ὃ σὺ μισεῖς ἑτέρῳ μὴ ποιήσεις → don't do to others what you don't want them to do to you
simply: P. and V. ἁπλῶς.
guilelessly: P. ἀδόλως.
genuinely: P. ἀληθινῶς, ἀκιβδήλως; see really.