noneffective vs pithless

noneffective

adj

  • Not effective. 

  • Not able to assume active duty. 

noun

  • A member of the military who is unable to assume active duty. 

pithless

adj

  • Not cogent. 

  • Lacking strength or pith; weak. 

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