unappropriate vs unproper

unappropriate

adj
  • Inappropriate; unsuitable. 

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

unproper

adj
  • Improper, not according with good standards of behaviour; indecent, indecorous. 

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