What does unforgettable mean?
“Unforgettable” is an adjective meaning extremely memorable: something that is impossible or very difficult to forget. It is commonly used for experiences, moments, performances, people, and impressions that have a powerful emotional or aesthetic effect. The word often suggests not merely factual importance but lasting emotional impact, as in “an unforgettable evening.” Its construction gives the idea of emphasis: the prefix “un-” reverses the idea of forgetting, while the suffix “-able” indicates that something can be forgotten. Although “unforgettable” is frequently positive, it is also used for painful or serious events, such as an unforgettable mistake. In general English, the word is emphatic rather than strictly literal, describing something especially remarkable rather than claiming that memory is objectively impossible.
adjectiveSo memorable or striking that it is impossible or very difficult to forget. It can describe experiences, moments, performances, mistakes, or other events that leave a lasting impression.
- So memorable or emotionally powerful that it is impossible or very difficult to forget.
"Her final performance was unforgettable, combining remarkable skill with genuine emotion."
"The reunion with her old friends was an unforgettable experience."
"The mistake was unforgettable and changed the way the team approached its work."
Sometimes one moment contains a lifetime of feeling—and the word for it is unforgettable.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unforgettable come from?
“Unforgettable” was formed in English during the late eighteenth century from “un-” meaning “not,” “forget,” and the adjective suffix “-able.” “Forget” descends from Old English “forgietan,” meaning to fail to remember or lose the memory of. The suffix “-able” comes through French from Latin, and its use reflects the long-established English pattern of forming adjectives from verbs, as in “lovable” and “changeable.”
Related word forms
How unforgettable is actually used
This is a common, emotionally expressive adjective in formal and informal English. It is especially frequent when describing striking experiences, performances, events, and personal moments, but it can also refer to mistakes, disasters, or other things that should never have happened.
Easily confused with unforgettable
“Unforgettable” means memorable enough to remain with someone, whereas “forgettable” means easy or likely to be forgotten.