nonpositive vs troubling

nonpositive

adj

  • Not positive. 

  • Not positive; either zero or negative. 

noun

  • Any value that is not positive. 

troubling

adj

  • distressing, worrying 

noun

  • The infliction of trouble or distress. 

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