determinative vs unimaginable

determinative

noun
  • A member of a class of words functioning in a noun phrase to identify or distinguish a referent without describing or modifying it. 

  • An ideogram used to mark semantic categories of words in logographic scripts. 

adj
  • Sufficient to decide something (such as a question of fact or of law). 

unimaginable

adj
  • unable to be imagined; inconceivable or mind-boggling; beyond belief 

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