Is danger imminent or eminent?
How to remember it:
Think of the first syllables of immediately and imminent to remember that imminent means "about to occur" often in a threatening sense.
Eminent means "prominent" or "famous."
As it happens, these words have a shared root: -minent comes from a Latin word meaning "to project" or "to stand out." In imminent, this root originally suggested something like a threatening overhang above your head; in eminent it suggested something conspicuous.