unforgettable
USun-fer-GET-uh-buhl/ˌʌnfə(ɹ)ˈɡɛtəbəl/
- 1Too vivid or memorable to be forgotten easily, if ever.
Watching the sun rise over the canyon was an unforgettable experience.
The stench of the flooded basement was unforgettable, and not in a good way.
Oppositeforgettable
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Origin
From un- + forget + -able, or un- + forgettable.