nonreal vs unimaginable

nonreal

adj

  • Not real; unreal, imaginary. 

  • Not real; not of the real numbers. 

noun

  • A nonreal number. 

unimaginable

adj

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

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