むち無知muchi
1.

The state of lacking knowledge or information on a particular subject, often resulting in an inability to understand or make informed decisions.

2.

A condition characterized by a deficiency in education or learning, indicating a lack of scholarly knowledge or awareness.

3.

The absence of wisdom or discernment, often leading to foolish behavior or judgments that reflect a naivety in understanding complex matters.

4.

A description of someone who does not possess the relevant knowledge or cognitive abilities typically expected in certain situations, resulting in a disparity in common understanding.

Example:

彼はすぐに無知をさらけ出した。