indurate
definition
to make or become hard or unfeeling
example
Years of working in a high-pressure environment seemed to indurate her once compassionate nature, leading her to make decisions with little regard for others.
synonyms
hardenthickensolidify
word origin — from Latin 'indurare', meaning 'to harden'; derived from 'in-' meaning 'in, into' and 'durare' meaning 'to harden or last'.