Spartan vs intrepid

Spartan

noun

  • A citizen of Sparta; a native or inhabitant of Sparta. 

  • A red apple cultivar from British Columbia, Canada 

adj

  • Of or relating to Sparta or its citizens. 

intrepid

adj

  • Fearless; bold; brave. 

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