elvish

In The Fall of Arthur, when Tolkien writes of Avalon, he means that same elvish island.

It seemed odd to them that men had once worn so elvish an attire.

The laugh was light and mocking, a tinkling, elvish sound which the Highlander frowned to hear.

In manner he seemed elvish, or shy, with a habit of staring on the ground, as if he would find a hair.

But we never heard any elvish arrow whistling after us, or saw any more of the uncouth folk.

Birds were singing everywhere, and the green of new leaves clothed the land in elvish loveliness.