The term "most moldering" refers to something that is decaying or rotten to a significant degree. Antonyms for this phrase might include words like fresh, new, clean, vibrant, healthy, or lively. These terms describe things that are still in their prime, full of energy and vitality, and free from the signs of decay that can come with age or neglect. While most moldering things might be associated with death and decay, these antonyms hint at the possibility of new beginnings, freshness, and life. As such, they provide a more positive and hopeful perspective on the world, reminding us that there is always room for growth and renewal.