black sheep vs nothingburger

black sheep

noun
  • A nonconformist; an unusual or unconventional person, who may be rejected or disdained by others for this reason. 

  • Used other than figuratively or idiomatically: see black, sheep. 

  • A person who is not wholesome, honest, or trustworthy. 

  • A worker who refuses to strike; a scab. 

nothingburger

noun
  • A person who is a nonentity. 

  • Something of less importance than its treatment suggests. 

  • A person or object that is bland or unremarkable in appearance or impact. 

adj
  • bland or unremarkable in appearance 

  • disreputable, as of a person 

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