The antonyms for the word "more muttered" are amplified, announced, declared, enunciated, proclaimed, pronounced, shouted, and vocalized. These words connote a level of clarity and emphasis that is absent in the mumbled or muttered utterances. Amplified refers to a heightened volume, while announced, declared, and proclaimed suggest delivering information with authority and confidence. Enunciated and pronounced indicate a clearer articulation of words, while shouted and vocalized indicate a deliberate effort to project one's voice. Choosing the appropriate antonym for "more muttered" depends on the speaker's intent, the intended audience, and the context of the message.