tempered vs tentative

tempered

adj
  • Having a specified disposition or temper. 

  • Pertaining to the metallurgical process for finishing metals. 

  • Pertaining to the well-tempered scale, where the twelve notes per octave of the standard keyboard are tuned in such a way that it is possible to play music in any major or minor key and it will not sound perceptibly out of tune. 

  • Pertaining to the industrial process for toughening glass, or to such toughened glass. 

  • Moderated or balanced by other considerations. 

tentative

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

  • Uncertain; subject to future change. 

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

noun
  • A trial; an experiment; an attempt. 

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