undocumented vs undue

undocumented

adj
  • Not having official documentation required to legally enter, reside in, or work in a country. 

  • Lacking instructions or reference material. 

  • Not having official documents that provide identification, authorization, etc. 

noun
  • Synonym of undocumented immigrant 

undue

adj
  • Not owing or payable. 

  • That which ought not to be done; illegal; unjustified. 

  • Excessive; going beyond that what is natural or sufficient. 

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