noneffective vs unessential

noneffective

adj

  • Not effective. 

  • Not able to assume active duty. 

noun

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

unessential

adj

  • Not essential. 

  • Void of essence, or real being. 

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