duly vs respectably

duly

adv
  • In a due, fit, or becoming manner; as it ought to be; properly. 

  • Regularly; at the proper time. 

respectably

adv
  • In a respectable manner; so as to gain respect. 

  • Moderately; pretty well. 

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