The antonyms for the word "most beat-up" would be words like immaculate, pristine, perfect or superb, which indicate the opposite of the rough, battered condition usually associated with something that is "most beat-up." These words imply that something is in excellent shape or condition, with no signs of wear and tear. While the term "most beat-up" has negative connotations, antonyms like exquisite, elegant, polished, or flawless connote positivity, beauty or elegance. It is essential to understand the opposite meanings of words to be able to communicate your ideas and thoughts more effectively, especially when you want to describe things or situations.