certifiably vs plainly

certifiably

adv
  • Undoubtedly, demonstrably. 

  • With the potential for certification. 

  • To a great extent. 

  • Genuinely 

plainly

adv
  • Obviously; clearly. 

  • In a plain manner; simply; basically. 

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