askance vs doubtingly

askance

adv
  • With disapproval, skepticism, or suspicion. 

  • Sideways; obliquely. 

verb
  • To turn (one's eye or gaze) to the side. 

  • To look at (someone or something) with a sideways glance. 

adj
  • Turned to the side, especially of the eyes. 

doubtingly

adv
  • In a doubting manner. 

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