inefficacious vs noneffective

inefficacious

adj

  • Not effective. 

  • Incapable of having the intended consequence. 

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 inefficacious and noneffective occurred in a corpus of books? (source: Google Ngram Viewer )