The question is incomprehensible to me.

我看不懂这个问题。

His behaviors are incomprehensible.

他的行为举止令人费解。

He speaks a very incomprehensible dialect.

他说的是一种极难懂的方言。

Some application forms can be incomprehensible to ordinary people.

有些申请表格一般人可能看不懂

He burbled something incomprehensible.

他嘟嘟囔囔地不知说了些什么。

The report was fairly incomprehensible.

这份报告相当难懂。

He found his son's actions totally incomprehensible.

他感觉儿子的行为完全无法理解。

He spent his time devising incomprehensible mathematics puzzles.

他把时间花在设计难以破解的数学难题上。

Some application forms can be incomprehensible to ordinary people.

有些申请表格一般人可能看不懂。