straightedge vs tentative

straightedge

adj
  • Living one's life opposing or eschewing the use of substances such as alcohol, tobacco, and drugs. 

noun
  • A flat, rectangular tool used to draw, cut or check the straightness of straight lines. 

tentative

adj
  • Of or pertaining to a trial or trials; essaying; experimental. 

  • restrained; polite; feeling one's way, not using full force. 

  • Uncertain; subject to future change. 

noun
  • A trial; an experiment; an attempt. 

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