The term "more well-established" refers to something that is firmly established and has gained a reputation over time. Its antonyms include words like unestablished, unstable, emerging, new, and undeveloped. Unestablished refers to something that is not yet firmly settled or recognized. An unstable entity is one that is unsteady and prone to change. An emerging concept is still in the early stages of developing and may lack widespread recognition. Something new is just starting and has not yet gained a track record or reputation. Undeveloped describes something that is not yet fully grown or is in a primitive state of development. The antonyms of "more well-established" demonstrate the importance of stability, consistency, and maturity.