The antonyms for the term "more aeonian" are quite simple. The word "aeonian" refers to something that is eternal or everlasting, so the antonyms are words that are the opposite of that, such as temporary, fleeting, or transient. These words describe things that are not permanent or long-lasting. For example, a momentary feeling of happiness could be described as transient or short-lived. Similarly, a temporary rain shower could be described as fleeting, unlike the permanent flow of a river. In short, the antonyms for "more aeonian" are words that describe things that are not eternal or long-lasting, but rather momentary or temporary.