Definition of unnegotiable in US English:

unnegotiable

adjective

  • Not negotiable.

Origin

Late 18th century; earliest use found in Thomas Bridges (?1710–?1775), playwright and novelist. From un- + negotiable.

Pronunciation

unnegotiable

/(ˌ)ʌnnɪˈɡəʊʃ(ɪ)əbl/