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"I failed to comprehend" is correct and usable in written English.
You can use it when you want to express that you did not understand something. For example, "I failed to comprehend the lecture despite the professor's clear explanation."
Exact(1)
My exhilaration at Tessa's great power soon gave way to apprehension, as though I were riding an unruly horse; and, when I failed to comprehend the crossover steps as described by Dulce, Tessa used her might to drag me into position with a determined expression on her face.
Similar(57)
(Incidentally, this is hardly my area of expertise, but I fail to comprehend why any sane 21st-century human would refuse an epidural.
In particular, when I talk to my clients about their pet's urinalysis results sometimes I fail to comprehend that they are not in the medical field and have no idea what I'm talking about.
If I had failed to comprehend the sheer vastness of the reserve before, I got it now.
I had failed to comprehend that my acts of charity were corroding any self-esteem he had left.
Many of these are for obsessive-compulsives only: I've tried and failed to comprehend the CD cult of the late Romanian conductor Sergiu Celibidache, whose chief distinction was that he played everything more slowly than anyone else.
Clara was singing something that I strained to hear, and failed to comprehend.
Like Mary, Joseph failed to comprehend Jesus' ironic question, " 'How is it that you sought me?
At the time, Cecil failed to comprehend the sheikh's ambitions for his homeland.
No matter whom she spoke with, it seemed as if each person failed to comprehend what Totonno's signified.
Blinded by hatred, he failed to comprehend what Reverend Pinckney so well understood – the power of God's grace.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com