evidential vs tentative

evidential

adj
  • Of or providing evidence. 

noun
  • A syntactic element (affix, clitic, or particle) that indicates evidentiality. 

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 evidential and tentative occurred in a corpus of books? (source: Google Ngram Viewer )