nonpositive vs unlucky

nonpositive

adj

  • Not positive. 

  • Not positive; either zero or negative. 

noun

  • Any value that is not positive. 

unlucky

adj

  • Inauspicious. 

  • Having ill luck. 

  • Bringing ill luck. 

  • Unfortunate, marked by misfortune. 

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