Machiavellianism vs opportunism

Machiavellianism

noun
  • Any ruthless, duplicitous behavior. 

  • A psychological trait centered on interpersonal manipulation, unemotional coldness, and indifference to morality. 

  • A political philosophy, based on the writings of Machiavelli, especially The Prince, that advocates the use of ruthlessness and duplicity in political dealings. 

  • A political maneuver that exemplifies the philosophy. 

opportunism

noun
  • The practice of taking advantage of any situations or people to achieve an end, often with no regard for principles or consequences. 

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