If you love to talk about what a strict vegan you are, your friends might start calling you a fundamentalist, or a person who sticks very closely to a particular set of principles.

The word fundamentalist is used most often to talk about religion. As an adjective, it describes a very strict, literal interpretation of a religious text or set of beliefs, and the noun means a person who holds those firm, often extreme, beliefs. Fundamentalist is a relatively recent term, invented in the 1920s in the United States to describe a Protestant movement during that era.

Definitions of fundamentalist
  1. noun
    a supporter of fundamentalism
    see moresee less
    type of:
    an adherent of Protestantism
  2. adjective
    of or relating to or tending toward fundamentalism
    synonyms: fundamentalistic
Word Family

Test prep from the experts

Boost your test score with programs developed by’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week