The word "un-enduring" refers to something that is not able to last or withstand for a long time. The antonyms of this word are words that describe something that is durable, long-lasting, and enduring. Some of the antonyms of "un-enduring" are: enduring, lasting, permanent, stable, steady, consistent, strong, and resilient. These antonyms describe things that have the ability to sustain and persist through time, such as a strong foundation, a durable material, or a stable relationship. By using these antonyms, we can emphasize the importance of building things that can endure and withstand the test of time.