When it comes to describing something or someone that will never be forgotten, there are several synonyms to consider. One of the more formal phrases is "immortalized in memory," which speaks to the idea that the person or event will live on forever in people's minds. "Indelibly etched" is another memorable way to describe a lasting impression, as it suggests an image that has been permanently imprinted. "Unforgettable" is a simple and straightforward way to convey the same sentiment, while "timeless" implies a sense of significance and importance that will endure for years to come. Ultimately, no matter which synonym you choose, the message remains clear: this person or event will always hold a special place in our hearts and minds.