singularly vs unbelievingly

singularly

adv
  • Extremely; remarkably. 

  • In the singular number; in terms of a single thing. 

  • solely; only; uniquely 

  • Strangely; oddly. 

unbelievingly

adv
  • Synonym of incredibly 

  • In an unbelieving way. 

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