definitive vs indubious

definitive

adj
  • conclusive or decisive 

  • general, not issued for commemorative purposes 

  • explicitly defined 

  • definite, authoritative and complete 

  • limiting; determining 

noun
  • an ordinary postage stamp that is part of a series of all denominations or is reprinted as needed to meet demand 

  • a word, such as a definite article or demonstrative pronoun, that defines or limits something 

indubious

adj
  • Not dubious or doubtful; certain. 

  • Not doubting; unsuspecting. 

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