dead calm vs easygoing

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. 

easygoing

adj

  • unhurried 

  • calm, relaxed, casual and informal 

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