These meanings come together in some ironic ways throughout the play. The clearest example of this is how Iago uses personal dishonesty (lies and deceit) to convince Othello that his wife is sexually dishonest (cheating on her husband), all while pretending to be looking out for the best interests of his so-called friend. Check out how Iago plays the martyr when Othello warns him that he, Iago, better not be lying about Desdemona: