Naivety bordering on obtuseness helped sustain his faith.近乎鲁钝的天真使他坚守自己的信仰。

the obtuseness of the angle呈钝角

The triangles have a degree of obtuseness.这些三角形都是钝角的。

the unfeeling obtuseness无感觉

The worst symptom is an obtuseness, a sort of numbness.最糟糕的症状是没有明显的感觉, 也就是一种麻木感。