fuzzy vs ill-defined

fuzzy

adj
  • Not clear; unfocused. 

  • Vague or imprecise. 

  • Covered with fuzz or a large number of tiny loose fibres like a carpet or many stuffed animals 

  • Employing or relating to fuzzy logic. 

noun
  • A person, especially a college student, interested in humanities or social sciences, as opposed to one interested in mathematics, science, or engineering. 

  • A very small piece of plush material. 

  • Something covered with fuzz or hair, as an animal or plush toy. 

  • A soldier with the rank of private. 

ill-defined

adj
  • Poorly defined; blurry, out of focus; lacking a clear boundary. 

  • Defined in an inconsistent way. 

How often have the words fuzzy and ill-defined occurred in a corpus of books? (source: Google Ngram Viewer )