impressive vs solemn

impressive

adj
  • Capable of being impressed. 

  • Appealing. 

  • Making, or tending to make, a positive impression; having power to impress 

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 impressive and solemn occurred in a corpus of books? (source: Google Ngram Viewer )