droll vs solemn

droll

adj
  • Oddly humorous; whimsical, amusing in a quaint way; waggish. 

solemn

adj
  • Inspiring serious feelings or thoughts; sombrely impressive. 

  • Characterized by or performed with appropriate or great ceremony or formality. 

  • Of or pertaining to religious ceremonies and rites; (generally) religious in nature; sacred. 

  • Deeply serious and sombre; grave. 

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