frivolous vs verecund

frivolous

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

  • 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. 

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

verecund

adj
  • modest 

  • bashful 

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