Synonyms of coarsen
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bluntIf something blunts an emotion, a feeling or a need, it weakens it.
• Our appetite was blunted by the beer.
deadenIf something deadens a feeling or a sound, it makes it less strong or loud.
• He needs morphine to deaden the pain in his chest.
• They gave him morphine to dull the pain.
Thesaurus for coarsen from the Collins English Thesaurus