We can use superlative adverbs to make comparisons:
His ankles hurt badly, but his knees hurt
worst.
It rains
most often at the beginning of the year.
We use these words and phrases as intensifiers with superlatives:
When we intensify a superlative adverb, we often put
the in front of the adverb:
In our office, Jill works
by far the hardest.
Of the three brothers, Brian
easily runs
the fastest.