inessential vs noneffective

inessential

adj

  • Not essential. 

  • Lacking essence or being. 

noun

  • Something that is not essential 

noneffective

adj

  • Not effective. 

  • Not able to assume active duty. 

noun

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

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