exceptional, extraordinary, fixed in the mind, impressive, memorable, never to be forgotten, notable, striking
English Collins Dictionary - English synonyms & Thesaurus
If you describe something as unforgettable, you mean that it is, for example, extremely beautiful, enjoyable, or unusual, so that you remember it for a long time. You can also refer to extremely unpleasant things as unforgettable. adj
A visit to the Museum is an unforgettable experience..., ...the leisure activities that will make your holiday unforgettable.
unforgettably adv usu ADV cl/group
...an unforgettably unique performer.
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