Synonyms of 'coarsen'
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If something blunts an emotion, a feeling or a need, it weakens it.
Our appetite was blunted by the beer.
If something deadens a feeling or a sound, it makes it less strong or loud.
He needs morphine to deaden the pain in his chest.
Thesaurus for coarsen from the Collins English Thesaurus
If something coarsens or is coarsened , it becomes thicker or rougher in texture .