badly vs certifiably

badly

adv
  • Very much; to a great degree. 

  • In a bad manner. 

adj
  • Ill, unwell. 

certifiably

adv
  • To a great extent. 

  • With the potential for certification. 

  • Undoubtedly, demonstrably. 

  • Genuinely 

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