enigmatic vs unthought-of

enigmatic

adj

  • Enigmatical. 

  • Defying description. 

  • Pertaining to an enigma. 

  • Mysterious. 

unthought-of

adj

  • unexpected 

  • unimagined 

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