milk-and-water vs vapid

milk-and-water

adj

  • Insipid, wishy-washy, weak. 

noun

  • Something insipid or mawkish. 

vapid

adj

  • Tasteless, bland, or insipid. 

  • Lifeless, dull, or banal. 

  • Offering nothing that is stimulating or challenging. 

How often have the words milk-and-water and vapid occurred in a corpus of books? (source: Google Ngram Viewer )