ill-defined vs some kind of

ill-defined

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

  • Defined in an inconsistent way. 

some kind of

det
  • A remarkable. 

  • a mediocre; a bare minimum; (denoting that something only barely fits a certain category, or is very mediocre in it) 

  • Used other than figuratively or idiomatically: see some, kind, of. 

adv
  • Used as an intensifier of adjectives: remarkably 

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