To denigrate someone is to criticize them heavily and often unfairly. Denigrate can also mean "to make something seem less important or valuable."

// Her essay denigrates her mentor as a person and as a teacher.

// Though initially quick to denigrate the work that had been done, the group quickly realized that those efforts had laid a good foundation for what they themselves hoped to accomplish.

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"As much as I want to have good taste in books, as much as I want to use that status to sell books that I think make the world a better place … I need to be cognizant of ways people like me have used 'good taste' as an act of cultural authoritarianism to manipulate culture, denigrate creations from other identities, and empower themselves at the expense of others." — Josh Cook, The Art of Libromancy: Selling Books and Reading Books in the Twenty-First Century, 2023

The word denigrate has been part of English since the 16th century and can be traced back to the Latin nigrare, meaning "to blacken." When denigrate was first used, it meant "to cast aspersions on someone's character or reputation." Eventually, it developed a second sense of "to make black" ("factory smoke denigrated the sky"), representing an interesting case of a literal sense (now rare) following a figurative one. Nowadays, you’re most likely to hear denigrate used as a synonym of defame or belittle.