The term "most maintaining" refers to the quality of being the most persistent or enduring. It involves the ability to continue or sustain something over a long period of time. The antonyms for "most maintaining" are words that convey the opposite meaning, such as fleeting, temporary, or transient. These words suggest a lack of permanence or stability, and indicate that something is likely to fade away or disappear quickly. Other antonyms for "most maintaining" include sporadic, intermittent, occasional, and infrequent, all of which suggest a lack of regularity or consistency. The choice of antonym depends on the context in which the term is used.