unallowable vs unsuited

unallowable

adj
  • Not allowable 

  • For which an allowance may not be claimed 

unsuited

adj
  • Not compatible; mismatched. 

  • Not of the same suit. 

  • Not suited to a specific purpose. 

  • Not wearing a suit. 

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