נָאַף
From LSJ
Κατηγορεῖν οὐκ ἔστι καὶ κρίνειν ὁμοῦ → Iudex et accusator esse idem nequit → Wer anklagt, darf nicht auch noch Richter sein zugleich
English (Strong)
a primitive root; to commit adultery; figuratively, to apostatize: adulterer(-ess), commit(-ing) adultery, woman that breaketh wedlock.