The adjective unforgettable is used to refer to what cannot be forgotten. The unforgettable, therefore, remains in the memory despite the passage of time.
For example: "The debut of the young forward in the national team was unforgettable: he scored three goals and retired to an applause throughout the stadium" , "With my family we are going to enjoy a vacation that will surely be unforgettable since we will go to Walt for the first time Disney World ” , “ Frank Sinatra is an unforgettable singer who, two decades after his death, continues to have millions of fans around the planet ” .
What is unforgettable has unusual characteristics: that is why it remains in the mind. The everyday events that have no particularity, on the other hand, are usually forgotten.
A man may not remember what he had for dinner three nights ago. However, you may remember what you ate 25 years ago on your first date with the woman who is now your wife. This is because that outing is an unforgettable moment in your life, unlike most dinners.
It is important to note that, generally, the unforgettable is associated with the pleasant or the positive. Any individual would say that the day his son was born was unforgettable, but he would not say the same about the day in which he was unemployed after a decade, to cite one case. The two events, for better or for worse, continue to be remembered, but the rating of unforgettable is only used with respect to good memories.