The antonyms for "more aflutter" are "calm," "collected," "composed," "unperturbed," "unruffled," and "cool." When you are not aflutter, it means you are in a state of tranquility and ease, without any anxiety or agitation. In this state, you can make rational decisions and process information with clarity. Being calm allows us to approach challenges without being overwhelmed and enables us to navigate through life with grace and composure. It is important to cultivate a balanced state of mind to lead a fulfilling life. So, if you are feeling aflutter, take a deep breath and work towards achieving a calm and collected state of mind.