idiotic vs ignorant

idiotic

adj
  • Having the quality of idiocy; very foolish 

  • Pertaining to or resembling an idiot; characterised with behaviour resembling idiocy. 

ignorant

adj
  • Resulting from ignorance; foolish; silly. 

  • Ill-mannered, crude. 

  • Not knowing (a fact or facts), unaware (of something). 

  • Unknowledgeable or uneducated; characterized by ignorance. 

noun
  • One who is ignorant. 

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