The word "ephemeral" refers to something that is transient or lasting for a very short time. Let's examine the options to find the word closest in meaning:
Everlasting: This suggests something that lasts forever or is eternal, the opposite of ephemeral.
Temporary: This indicates something not permanent, aligning closely with the definition of ephemeral.
Unchangeable: This means something that cannot be altered, not related to the concept of ephemeral which denotes short-lived nature.
Fragile: While this implies delicacy, it does not specifically convey the temporality aspect of ephemeral.
Thus, the word closest in meaning to "ephemeral" is Temporary.