The word that best illustrates the mood of the poem is grief or sad tone.
What is a poem?
A poem refer to write ups in which the author or write use it to express his feelings, thoughts or emotions to his audience.
Therefore, The word that best illustrates the mood of the poem is grief or sad tone.
Nothing Gold Can Stay
by Robert Frost
Nature's first green is gold,
Her hardest hue to hold.
Her early leaf’s a flower;
But only so an hour.
Then leaf subsides to leaf.
So Eden sank to grief,
So dawn goes down to day.
Nothing gold can stay.
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