All 5 Uses

comprehend
in
Passing, by Nella Larsen
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She was wholly unable to comprehend such an attitude towards danger as she was sure the letter's contents would reveal; and she disliked the idea of opening and reading it.†
p. 9.5 *

comprehend = understand -- especially to understand it completely
Gertrude Martin nodded in complete comprehension.†
p. 37.4

comprehension = the understanding of something
It was unfathomable, utterly beyond any experience or comprehension of hers.†
p. 46.8
And she, who had prided herself on knowing his moods, their causes and their remedies, had found it first unthinkable, and then intolerable, that this, so like and yet so unlike those other spasmodic restlessnesses of his, should be to her incomprehensible and elusive.†
p. 88.3

incomprehensible = not understandable

standard prefix: The prefix "in-" in incomprehensible means not and reverses the meaning of comprehensible. This is the same pattern you see in words like invisible, incomplete, and insecure.
Now she turned on him a totally uncomprehending look, a bit questioning.†
p. 103.9

uncomprehending = not understanding

standard prefix: The prefix "un-" in uncomprehending means not and reverses the meaning of comprehending. This is the same pattern you see in words like unhappy, unknown, and unlucky.

Definitions:

(1) (comprehend)
to understand something -- especially to understand it completely
(2) (meaning too rare to warrant focus)
Much more rarely (and more frequently in the past), comprehend can mean to include as part of something broader. That was the first sense of the word listed in Webster's Dictionary of 1828 with this sample sentence: "The empire of Great Britain comprehends England, Scotland and Ireland, with their dependencies."