fallacious vs ungrounded

fallacious

adj
  • Characterized by fallacy; false or mistaken. 

  • Deceptive or misleading. 

ungrounded

adj
  • Not grounded; without ground or basis, unreal, false. 

  • Not connected to ground potential 

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