这场事故是他自己愚蠢的结果。

The accident was a result of his own ___stupidity.

这类有害政策往往源于傲慢与愚蠢。

Such harmful policies are often born out of arrogance and ___stupidity.

对他人的偏见通常源于无知和愚蠢。

Prejudices against others usually stem from ignorance and ___stupidity.