diehard vs eccentric

diehard

adj
  • Unreasonably or stubbornly resisting change. 

  • Fanatically opposing progress or reform. 

  • Complete; having no opposite opinion of anything in a particular topic of one's values; thorough of in one's beliefs. 

noun
  • A person with such an attitude. 

eccentric

adj
  • Deviating from the norm; behaving unexpectedly or differently; unconventional and slightly strange. 

  • Having a different center; not concentric. 

  • Against or in the opposite direction of contraction of a muscle (such as results from flexion of the lower arm (bending of the elbow joint) by an external force while contracting the triceps and other elbow extensor muscles to control that movement; opening of the jaw while flexing the masseter). 

  • Having different goals or motives. 

  • Not at or in the centre; away from the centre. 

  • Not perfectly circular; elliptical. 

noun
  • One who does not behave like others. 

  • A kook; a person of bizarre habits or beliefs. 

  • A circle not having the same centre as another. 

  • An exercise that goes against or in the opposite direction of contraction of a muscle. 

  • A disk or wheel with its axis off centre, giving a reciprocating motion. 

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