dunkable vs impermeable

dunkable

adj

  • Waterproof. 

  • Suitable for dunking (as of food). 

noun

  • Any food item suitable for dunking. 

impermeable

adj

  • Not allowing passage, especially of liquids; waterproof. 

  • Impossible to permeate. 

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