arcane vs runish

arcane

adj
  • Obscure, mysterious. 

  • Understood by only a few. 

  • Extremely old (e.g. interpretation or knowledge), and possibly irrelevant. 

  • Requiring secret or mysterious knowledge to understand. 

runish

adj
  • Mysterious; strange. 

  • Of or relating to runes, runic inscription, or runic language; runic. 

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