dead calm vs jejune

dead calm

adj

  • Completely still with no waves and no wind. 

noun

  • The condition of a perfectly flat sea with no waves and no wind. 

jejune

adj

  • Lacking matter; empty; devoid of substance. 

  • Naive; simplistic. 

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