The best option seems to be "unstoppable", taking into consideration the prefix, syntax, and context.
Inexorable has the prefex in-, meaning not. So death is something that is not-exorable. The adjective exorable comes from the Latin word <em>exorare</em>, which means "to entreat". Therefore, if a person is inexorable, it is impossible to persuade them by supplicating or entreating. When it comes to something such as an event, it means there is no escaping it, no way to stop it, nothing anyone could say to make it different.
Death is, thus, an inexorable (unstoppable) event.
THe answer to your question is Unhappy, reread, restless, comfortable. An affix is an additional word or element attached to a word. For example Un-Happy. You are putting "un" in front of the word happy, making it unhappy
