erratic vs mad

erratic

adj
  • Deviating from normal opinions or actions; eccentric; odd. 

  • Unsteady, random; prone to unexpected changes; not consistent. 

noun
  • A rock moved from one location to another, usually by a glacier. 

  • Anything that has erratic characteristics. 

mad

adj
  • Extremely foolish or unwise; irrational; imprudent. 

  • Bizarre; incredible. 

  • Having impaired polarity. 

  • Wildly confused or excited. 

  • Intensifier, signifying abundance or high quality of a thing; very, much or many. 

  • Abnormally ferocious or furious; or, rabid, affected with rabies. 

  • Insane; crazy, mentally deranged. 

  • Used litotically to indicate satisfaction or approval. 

  • Angry, annoyed. 

  • Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for. 

verb
  • To madden, to anger, to frustrate. 

adv
  • Intensifier; to a large degree; extremely; exceedingly; very; unbelievably. 

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