“鲁钝的”用英语怎么说

近乎鲁钝的天真使他坚守自己的信仰。Naivety bordering on obtuseness helped sustain his faith.罗伯特看着他那张鲁钝的 、 胡子巴楂的脸.Robert looked at the man's heavy, beard - stubbled face....