Here are some ways to think about "nonnegotiable":
* Unchangeable: Like a fixed price on a product, it won't be adjusted.
* Unquestionable: It's a rule or policy that must be followed, without any exceptions.
* Final: There's no opportunity to alter or renegotiate the terms.
Examples:
* "This deadline is nonnegotiable." Meaning, the deadline is fixed and cannot be changed.
* "Our company policy is nonnegotiable." Meaning, the policy cannot be altered for anyone.
* "The price is nonnegotiable." Meaning, there's no room for bargaining or discounts.
Essentially, "nonnegotiable" signifies something that is absolute and inflexible.