inadequate vs nonpositive

inadequate

adj

  • Not adequate; not fit for the purpose 

noun

  • An individual who is inadequate. 

nonpositive

adj

  • Not positive. 

  • Not positive; either zero or negative. 

noun

  • Any value that is not positive. 

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