asinine

他那种愚蠢的固执让所有人都感到沮丧。

His ___asinine stubbornness frustrated everyone.

他在考试中提出的那个荒谬问题让全班都笑了。

His ___asinine question during the exam made the whole class laugh.

他声称可以通过吃冰淇淋减肥，这种说法简直荒谬至极。

His claim that you can lose weight by eating ice cream is complete ___asinine.