lightless vs privative

lightless

adj

  • Lacking light; unilluminated; dark. 

privative

adj

  • indicating the absence of something 

  • causing privation; depriving 

  • consisting in the absence of something; negative 

noun

  • something that causes privation or indicates an absence 

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