Un-negotiable, meaning non-negotiable, inflexible, or fixed, has several antonyms used in different contexts. In business or legal matters, negotiable serves as the direct opposite, indicating that something is capable of being compromised or bargained. In decision-making, flexibility, adaptability, and openness are antonyms of un-negotiable, meaning that a person or entity is willing to consider different options and ideas. Alternatively, pliable, compliant, or accommodating can also imply the opposite of un-negotiable, indicating a readiness to compromise or make concessions. Overall, understanding the antonyms of un-negotiable in specific contexts is crucial to negotiating and accommodating diverse views and ideas.