frivolous vs ponderous

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. 

ponderous

adj
  • Dull, boring, tedious; long-winded in expression. 

  • Heavy, massive, weighty. 

  • Clumsy, unwieldy, or slow, especially due to weight. 

  • Characterized by or associated with pondering. 

  • Serious, onerous, oppressive. 

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