frivolous vs set in one's ways

frivolous

adj
  • Having no reasonable prospect of success because its claim is without merit, lacking a supporting legal or factual basis, while the filing party is, or should be, aware of this. 

  • Of little weight or importance; not worth notice; slight; trivial. 

  • Silly, especially at an inappropriate time or in an inappropriate manner. 

set in one's ways

adj
  • Driven by habit; inclined or determined to continue according to one's custom or established preferences. 

How often have the words frivolous and set in one's ways occurred in a corpus of books? (source: Google Ngram Viewer )