What would be a synonym for the word 'ephemeral'?

The term 'ephemeral' refers to something that is short-lived or transitory, often lasting for a very brief period. A synonym for 'ephemeral' is 'temporary,' as both words convey the idea of being fleeting or not lasting for a long time. When something is described as temporary, it suggests that it is not intended to last, mirroring the essence of the word 'ephemeral.'

In contrast, 'permanent,' 'enduring,' and 'timeless' describe concepts or states that imply longevity and stability, which directly oppose the meaning of 'ephemeral.' Therefore, 'temporary' is indeed the best synonym to capture the short-lived quality of something that is ephemeral.