The antonyms for the word "un negotiable" refer to situations, actions or agreements that can be modified, adjusted or changed according to the circumstances or negotiations. Some antonyms for the word "un negotiable" include adjustable, changeable, negotiable, flexible, modifiable, open to negotiation, subject to discussion, and alterable. These terms indicate concepts that can be modified, renegotiated or changed depending on the context, rather than being fixed or set in stone. For example, a contract with negotiable terms would allow parties to discuss and potentially revise certain clauses or conditions. Conversely, an un negotiable contract would mean that terms cannot be changed or revised, and are considered final.