solemn vs unique

solemn

adj
  • 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. 

  • Deeply serious and sombre; grave. 

unique

adj
  • Particular, characteristic. 

  • Of a rare quality, unusual. 

  • Being the only one of its kind; unequaled, unparalleled or unmatched. 

  • Of a feature, such that only one holder has it. 

noun
  • A thing without a like; something unequalled or unparallelled; one of a kind. 

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