vague vs well-grounded

vague

noun
  • An indefinite expanse. 

verb
  • To make vague negative comments publicly; to make highly veiled complaints or insults. 

  • To become vague or act in a vague manner. 

adj
  • Not clearly felt or sensed; somewhat subconscious. 

  • Not clearly defined, grasped, or understood; indistinct; slight. 

  • Lacking expression; vacant. 

  • Not having a precise meaning. 

  • Not thinking or expressing one’s thoughts clearly or precisely. 

  • Not sharply outlined; hazy. 

  • Not clearly expressed; stated in indefinite terms. 

  • Wandering; vagrant; vagabond. 

well-grounded

adj
  • Of a person: having extensive knowledge of a subject. 

  • Of an argument, etc.: based on good judgment and solid reasoning. 

How often have the words vague and well-grounded occurred in a corpus of books? (source: Google Ngram Viewer )