inoppugnable vs uncontrovertible

inoppugnable

adj

  • Indisputable, incontestable, unquestionable. 

  • Insuperable, insurmountable. 

uncontrovertible

adj

  • incontrovertible 

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