dead calm vs insipid

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. 

insipid

adj

  • Unappetizingly flavorless. 

  • Flat; lacking character or definition. 

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