irrelevant vs unappropriate

irrelevant

adj
  • Not usefully related: not associated in any way that is important or useful to the context being discussed: not materially applicable; having connections not applicable in the present situation. 

  • Not at all related: totally unrelated, wholly unconnected, completely inapplicable. 

unappropriate

adj
  • Inappropriate; unsuitable. 

verb
  • To take from private possession; to restore to the possession or right of all. 

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