solemn vs unsmiling

solemn

adj
  • Deeply serious and sombre; grave. 

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

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

  • Inspiring serious feelings or thoughts; sombrely impressive. 

unsmiling

adj
  • Not smiling; serious or grave 

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