naff vs nonpositive

naff

adj

  • Bad; tasteless, poorly thought out, not workable. 

  • Heterosexual. 

nonpositive

adj

  • Not positive. 

  • Not positive; either zero or negative. 

noun

  • Any value that is not positive. 

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