backboneless vs caitiff

backboneless

adj

  • Cowardly, spineless. 

  • Without a backbone; invertebrate. 

caitiff

adj

  • Especially despicable; cowardly 

noun

  • A base or despicable person; a wretch 

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