un ‧ for ‧ get ‧ ta ‧ ble /ˌʌnfəˈɡetəb ə l◂ $ -fər-/ BrE AmE adjective
[ Word Family: adverb : ↑ forgetfully , ↑ unforgettably ; adjective : ↑ forgetful , ↑ forgettable ≠ ↑ unforgettable ; verb : ↑ forget ; noun : ↑ forgetfulness ]
an unforgettable experience, sight etc affects you so strongly that you will never forget it, especially because it is particularly good or beautiful ⇨ memorable :
A visit to Morocco is a truly unforgettable experience.
—unforgettably adverb