What is a synonym for the word ephemeral?

Here are some synonyms for "ephemeral," depending on the specific nuance you're looking for:

General synonyms:

* Fleeting

* Transient

* Short-lived

* Passing

* Temporary

* Momentary

* Fugacious (formal)

More specific synonyms:

* Evanescent: Emphasizes a gradual fading away

* Transitory: Emphasizes a sense of movement or change

* Fugitive: Emphasizes a sense of escaping or disappearing quickly

* Volatile: Emphasizes a sense of instability or unpredictability

The best synonym for "ephemeral" will depend on the context in which it is used.