caloric vs lukewarm

caloric

adj
  • Synonym of calorific (“relating to or producing heat or other energy”). 

  • Synonym of calorific (“high in calories and thus likely fattening”). 

  • Relating to calories. 

  • Containing calories. 

noun
  • The hypothetical medium of heat. 

lukewarm

adj
  • Between warm and cool. 

  • Unenthusiastic (about a proposal or an idea). 

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