callous vs lenient

callous

adj
  • Having calluses, or relating to calluses. 

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

lenient

noun
  • A lenitive; an emollient. 

adj
  • Lax; not strict; tolerant of dissent or deviation 

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