This compound adjective (alpha-privative + kataginosko) means "not to be condemned," "beyond reproach," or "above criticism." Paul uses it in Titus 2:8 instructing Titus about sound teaching and conduct: "sound speech that cannot be condemned." The term describes speech so pure and truthful that opponents find no grounds for legitimate criticism. It's not that enemies won't attack but that they'll find nothing genuinely blameworthy, forcing them either to fabricate charges or be silenced by the obvious integrity of the message and messenger. The goal is blamelessness that disarms criticism.