indubious vs univocal

indubious

adj
  • Not doubting; unsuspecting. 

  • Not dubious or doubtful; certain. 

univocal

adj
  • Unequivocal; indubitable. 

  • Containing instances of only one vowel; univocalic. 

  • Having unison of sound, as the octave has in music. 

  • Having only one possible meaning. 

  • Having always the same drift or tenor; uniform; certain; regular. 

noun
  • A document containing instances of only one vowel. 

  • A word having only one meaning. 

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