What words does the poet use to show strength of the blacksmith?

In the poem
","describes both the physical strength and spiritual strength of the
blacksmith.

To describe the blacksmith's physical strength, the poet first
proclaims that he is "a mighty man." Longfellow writes that he has "large and
sinewy hands." Sinews are connective tissues that attach muscles to bone, and in strong
men, they are clearly visible. The blacksmith's arms are brawny, which, according to the
Merriam-Webster Dictionary, means "muscular, strong, powerful." His muscles are
"strong as iron bands," which gives an indication of great strength. He swings a
"heavy sledge." This is in reference to a tool he uses called a sledgehammer, which
has a heavy iron head and a long wooden handle and is difficult for anyone but a strong man to
lift and swing. All these allusions to the blacksmith's physical strength are in the first part
of the poem.

In the second part, Longfellow describes the blacksmith's
spiritual strength. He has a daughter who sings in the village choir and some sons who sit with
him in church. However, his wife is "singing in paradise," and when he remembers
"how in the grave she lies," he "wipes a tear out of his eyes." In other
words, his wife has died, but he has several children, and he is raising them all alone as a
single parent. Longfellow praises the blacksmith's strength in the midst of sorrow as he relates
that "toiling, rejoicing, sorrowing, onward through life he goes." The blacksmith,
through his faithfulness, has taught the poet the lesson that "at the flaming forge of life
our fortunes must be wrought." The blacksmith's spiritual strength is even greater than his
physical strength, because he has the courage to keep going day after day, making his living and
raising his children.