approximate vs unassociated

approximate

verb
  • To come near to; to approach. 

  • To carry or advance near; to cause to approach. 

  • To estimate. 

adj
  • Nearing correctness; nearly exact; not perfectly accurate. 

  • Approaching; proximate; nearly resembling. 

unassociated

adj
  • Having no social ties, affiliations, unification, confederation, federation, or unionization. 

  • Having no statistical association. 

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