The antonyms for the word "most forgetting" are "unforgettable" or "memorable." When something is unforgettable, it remains in one's memory for a long time, and when it is memorable, it is worth remembering. Both are opposite of forgetting, which means to be unable to remember something. Some things can be unforgettable, such as a once-in-a-lifetime experience or a significant accomplishment. Similarly, certain events or moments can be memorable, such as a wedding, a new baby's birth, or a vacation. Overall, the antonyms of "most forgetting" convey that the experience or moment is significant enough to be remembered for a long time.