chilling vs trepid

chilling

adj

  • Causing mild fear. 

  • Becoming cold. 

  • Causing cold. 

noun

  • The act by which something is chilled. 

trepid

adj

  • Timid, timorous, fearful. 

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