freakish vs unsolvable

freakish

adj

  • Capricious, unpredictable. 

  • Resembling a freak. 

  • Strange, unusual, abnormal or bizarre. 

unsolvable

adj

  • Not solvable. 

noun

  • A problem that cannot be solved. 

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