nondescript vs titleless

nondescript

adj
  • Without distinguishing qualities or characteristics. 

noun
  • An unmarked police car. 

  • An undistinguished, unexceptional person or thing. 

  • A species or other type of creature that has not been previously described or identified. 

titleless

adj
  • Without noble title; common. 

  • Having no title; nameless. 

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