adequately vs passably

adequately

adv
  • In an adequate manner. 

  • Sufficient to satisfy a requirement or meet a need; sufficiently; satisfactorily. 

  • Barely satisfactory or sufficient. 

passably

adv
  • In a passable fashion; moderately; adequately. 

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