reprehensible vs unallowable

reprehensible

adj
  • Blameworthy, censurable, guilty. 

  • Deserving of reprehension. 

noun
  • A reprehensible person; a villain. 

unallowable

adj
  • For which an allowance may not be claimed 

  • Not allowable 

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