pioneering vs unambitious

pioneering

noun
  • A scoutcraft skill that involves building structures using staves and knots. 

  • The activity of the verb pioneer. 

adj
  • Involving accomplishments or activities that have not been done before, or developing or using new methods or techniques. 

unambitious

adj
  • having little ambition for success or achievement 

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