noun
a person who speaks about someone or something in a way that shows disapproval or lack of respect
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The critic was known to be a harsh disparager of new artists in the industry.
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She's always a disparager, never has a good thing to say about anyone.
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Don't listen to him, he's just a petty disparager trying to bring you down.
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His words were like arrows shot by a disparager, aiming to hurt rather than help.