no kidding vs really

no kidding

intj
  • Said in response to an obvious statement. 

  • An exclamation of amazement. 

really

intj
  • Indicating that what was just said was obvious and unnecessary; contrived incredulity 

  • Indicating affirmation, agreement. 

  • Indicating surprise at, or requesting confirmation of, some new information; to express skepticism. 

  • Indicating displeasure at another person's behaviour or statement. 

adv
  • Actually; in fact; in reality. 

  • Very (modifying an adjective); very much (modifying a verb). 

  • In a way or manner that is real, not unreal. 

How often have the words no kidding and really occurred in a corpus of books? (source: Google Ngram Viewer )