callous vs sentimental

callous

adj
  • Emotionally hardened; unfeeling and indifferent to the suffering/feelings of others. 

  • Having calluses, or relating to calluses. 

sentimental

adj
  • Characterized by sentiment, sentimentality or excess emotion. 

  • Derived from emotion rather than reason; of or caused by sentiment. 

  • Romantic. 

How often have the words callous and sentimental occurred in a corpus of books? (source: Google Ngram Viewer )