catlike vs under the radar

catlike

adj
  • resembling a cat; feline 

  • nimble, quick, graceful 

  • slow, deliberate, quiet and stealthy 

under the radar

prep
  • Without attracting notice; in an undetected or secretive manner. 

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