somewhat vs unthinkably

somewhat

adv
  • To a limited extent or degree. 

  • Very. 

noun
  • More or less; a certain quantity or degree; a part, more or less; something. 

  • A person or thing of importance; a somebody. 

unthinkably

adv
  • In an unthinkable manner. 

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