So remarkable or significant that it cannot be forgotten; leaving a lasting impression on memory.
Formed from 'un-' (not) + 'forgettable', which derives from 'forget' (Old English 'forgietan', meaning to lose hold of mentally) + '-able' suffix. The positive use of a negative prefix creates emphasis through litotes.
This word employs a fascinating linguistic trick called litotes - using a negative to express a strong positive. It's more powerful than simply saying 'memorable' because it suggests the memory is so strong it actively resists forgetting.
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