UNSOUND Copy link • UNSOUNDWith reference to truth, pravus: pravus et perversus (of opinions). To be unsound in faith, haereticum esse (ecclesiastical); *veram Christi legem non sequi; infectum esse opinionum pravitate. With reference to logical cogency, ad probandum infirmus (nugatoriusque): levis et infirmus: levis et nugatorius: inanis et levis (weak; of arguments). That is an unsound argument, nullum (vero) id quidem est argumentum. With reference to health. [Vid. SICKLY, UNHEALTHY.] Rotten, Vid.