Read this passage:
The Sea of Faith
Was once, too, at the full, and round earth's shore
Lay like the folds of a bright
But now I only hear
Its melancholy, long, withdrawing roar,
Retreating, to the breath
Of the night-wind, down the vast edges drear
And naked shingles of the world.
- Matthew Arnold, "Dover Beach"
Which word from this passage of Matthew Arnold's "Dover
Beach" makes the mood of the poem sad and lonely?