Antonyms for the phrase "most well worn" include freshest, newest, and most unused. The opposite of well-worn is something that is not worn out and appears to be in excellent condition. Fresh items are those that are free of wear and tear, and they are often refreshing to look at since they haven't been subjected to the same amount of stress and damage as old objects. The term "newest" refers to something that is brand new and has not yet been used, so it would be completely untouched and unscratched. Meanwhile, the phrase "most unused" indicates an object that hasn't been used often, meaning it's still in its original form.