Select the most appropriate ANTONYM of the underlined word in the given sentence.

The beauty of cherry blossoms is ephemeral, as the delicate pink petals bloom for only a short period.

The correct answer is Permanent.

Explanation:
The word "ephemeral" means lasting for a very short time, temporary, or fleeting. The sentence itself provides a clue: "...bloom for only a short period."

Let us examine the meanings of the given options:

1. Permanent: Means lasting or intended to remain unchanged indefinitely, which is the direct opposite (antonym) of ephemeral.
2. Transient: Means lasting only for a short time; impermanent (a synonym of ephemeral).
3. Uniform: Means remaining the same in all cases or character; consistent.
4. Unwavering: Means firm, steady, or resolute.

Therefore, Permanent is the most appropriate antonym of ephemeral.