From Longman Dictionary of Contemporary Englishcoarsencoars‧en /ˈkɔːsən $ ˈkɔːr-/ verb [intransitive, transitive] 1 ROUGH/NOT SMOOTHto become thicker or rougher, or to make something thicker or rougher Hard work had coarsened his hands.2 RUDE/OBSCENEto become or to make someone become less polite in the way they talk or behave He’s been coarsened by his experience of war.→ See Verb table
Examples from the Corpus
coarsen• The political process has become coarsened. 