frothy vs hairline

frothy

adj
  • lightweight; lacking depth or substance 

  • Foamy or churned to the point of becoming infused with bubbles. 

  • Highly speculative; having high risk and high return. 

noun
  • A serving of beer. 

hairline

adj
  • very thin, as thin as a hair 

noun
  • A fishing line made from hair. 

  • The line along one's forehead where hair starts growing. 

  • A very thin line in writing, drawing, or typography. 

  • A very thin fissure. 

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