The antonym for the word "more fettered" would be "less restrained" or "unfettered." When something is fettered, it is held back or limited in some way, and when something is unfettered, it is free to expand and grow without impediment. Using the right antonyms can greatly improve writing clarity because they allow you to convey the opposite meaning of a word with a single, concise word. So, when trying to express ideas related to freedom, liberation, or unboundedness, instead of using phrases like "more fettered" and "less fettered," you can use the antonyms unfettered or less restrained for greater impact.