Sentence examples for understood nothing from inspiring English sources

"understood nothing" is correct and usable in written English.
It is a complete sentence that means the subject did not comprehend or grasp any information or meaning. You can use "understood nothing" when describing a situation where someone fails to understand something completely. For example: - Despite listening carefully, I understood nothing of what the lecturer was saying. - The instructions were so confusing that Mary understood nothing and ended up making a mistake. - When I tried to learn French, I understood nothing of the grammar rules. - The foreign film had no subtitles, so I understood nothing of the dialogue. - The speaker's thick accent meant that most of the audience understood nothing of his presentation.