unforgettable
/ˌʌnfə(ɹ)ˈɡɛtəbəl/ adjective A2- Very difficult or impossible to forget. · The things he subjected me to were horrible and unforgettable.
From the library
The wind was freezing cold, but the experience of walking on a glacier was unforgettable.
Duke Ellington, a master composer and bandleader, created unforgettable melodies that changed American music forever.
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