incomprehension

uncountable

Lack of comprehension or understanding; inability to understand.

Japanese Meaning

理解不足 / 理解不能 / 理解の欠如

When she explained the advanced theory, his incomprehension was obvious to everyone.

彼女が高度な理論を説明したとき、彼の理解の欠如は皆に明らかだった。

Sense（1）

Lack of comprehension or understanding; inability to understand.

Stephen blushed; and his father looked from one to the other in a state of utter incomprehension.