Answer:
A synonym for "ultimate" could be "final," "conclusive," or "supreme."
Explanation:
Final: "Final" refers to something that is last or concluding in a series or progression. It suggests that there is nothing beyond it.
Conclusive: "Conclusive" means serving to settle an issue or put an end to doubt or uncertainty. It implies a decision or outcome that is definitive and leaves no room for further debate.
Supreme: "Supreme" denotes the highest in rank, authority, or degree. It implies the utmost or highest level achievable in a particular context.