Perduring means lasting for a long time or enduring something. Its antonyms refer to a lack of permanence or durability. Some antonyms include temporary, brief, fleeting, ephemeral, and transitory. These words indicate a short-lived existence or an impermanent state. For example, a flower's bloom is ephemeral, but a tree's leaves are enduring. Life is transitory, but memories can be lasting. The opposite of something that is perduring is something that is fleeting or impermanent. So, if someone asks about the permanence of something, you can respond with expressions like "temporary," "ephemeral," or "brief." These antonyms are quite useful to have and can help to convey the meaning in various contexts.