comprehend

To understand something completely.

To understand something without difficulty.

To only just be able to understand something; to find it very difficult to understand.

Used to express the complete inability to understand something, often due to its complexity or strangeness.

To have the capacity to understand something.

To lack the capacity to understand something.

Indicates that understanding something requires significant mental effort.

Indicates that something is beyond the limits of human understanding.

A more formal way to say that someone did not understand something, implying an attempt was made.