ineffective vs nonpositive

ineffective

adj

  • not having the desired effect; ineffectual 

  • lacking in ability; incompetent or inadequate 

nonpositive

adj

  • Not positive. 

  • Not positive; either zero or negative. 

noun

  • Any value that is not positive. 

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