plausible vs unopinionated

plausible

adj
  • Obtaining approbation; specifically pleasing; apparently right; specious. 

  • Seemingly or apparently valid, likely, or acceptable; conceivably true or likely. 

unopinionated

adj
  • Not opinionated; without strong opinions. 

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