honestly vs untruthfully

honestly

intj

  • Used to express exasperation, dismay, etc. 

adv

  • In an honest manner. 

  • Frankly, to be honest. 

untruthfully

adv

  • In an untruthful manner; falsely. 

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