"Незабываемая". Судя по всему, женский род предпочтителен, ибо песня обращена к женщине
Авторы песни - Ирвинг Гордон и Фил Рамакон
Английская википедия более категорична:
Unforgettable is a popular song written by Irving Gordon.
Ну и дальше тоже любопытно
The song's original working title was Uncomparable. The music publishing company asked Irving to change it to Unforgettable. The song was published in 1951.
Ну и еще:
The most popular version of the song was recorded by Nat King Cole in 1951, with an arrangement written by Nelson Riddle. A non-orchestrated version of the song recorded in 1952 is featured as a bonus track on the CD reissue of 1955's completely instrumental (save the bonus material) Penthouse Serenade.
Cole recorded the tune anew in 1961, in a stereo version of the Riddle arrangement, for the album The Nat King Cole Story. His version of the song was included in its entirety in the 2009 film Watchmen during the Comedian's death scene.
In 1991, after Elvis Presley's legendary musical director Joe Guercio had the idea, Cole's 1961 recording of the song was edited and remixed to create a duet with his daughter, Natalie, which won three awards at the Grammy Awards of 1992: Song of the Year, Record of the Year and Best Traditional Pop Vocal Performance
Есть и русский перевод.
Хорошая годная старинная классическая попса
Нэт Кинг Коул
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Натали Коул. Дочь (она на фото)
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Натали и Нэт
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Unforgettable
Unforgettable, that's what you are
Unforgettable though near or far
Like a song of love that clings to me
How the thought of you does things to me
Never before has someone been more
Unforgettable in every way
And forever more, that's how you'll stay
That's why, darling, it's incredible
That someone so unforgettable
Thinks that I am unforgettable too
Unforgettable in every way
And forever more, that's how you'll stay
That's why, darling, it's incredible
That someone so unforgettable
Thinks that I am unforgettable too