dough-faced vs invertebrate

dough-faced

adj

  • cowardly 

  • obsequious; fawning; pliable 

invertebrate

adj

  • Cowardly, uncourageous; lacking character. 

  • Lacking a backbone; without vertebrae. 

noun

  • A spineless person; a coward. 

  • An animal without vertebrae, i.e. backbone. 

How often have the words dough-faced and invertebrate occurred in a corpus of books? (source: Google Ngram Viewer )