unforgettable

US /ˌʌn.fɚˈɡet̬.ə.bəl/
UK /ˌʌn.fɚˈɡet̬.ə.bəl/
"unforgettable" picture
1.

impossible to forget; very memorable.

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It was an unforgettable experience.
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Her performance was truly unforgettable.
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memorablehistoricmomentousimpressivestriking