pending vs unresolved

pending

adj
  • Begun but not completed. 

  • About to happen; imminent or impending. 

  • Awaiting a conclusion or a confirmation. 

prep
  • While waiting for something; until. 

  • During. 

unresolved

adj
  • Not resolved. 

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