nonnegotiable Syllabification: (non·ne·go·ti·a·ble)Pronunciation: /ˌnä(n)nəˈgōSHəbəl/Definition of nonnegotiable adjective not open to discussion or modification. (of a document) not able to be transferred or assigned to the legal ownership of another person. nonnegotiable in other Oxford dictionaries Definition of nonnegotiable in the British & World English dictionary