breachless vs nonnegotiable

breachless

adj

  • Not to be breached; impregnable. 

  • Not breached. 

nonnegotiable

adj

  • Not negotiable; not subject to negotiation. 

noun

  • Something that is not negotiable. 

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