But the tendency to rapid sinking in this substance was in the present instance materially counteracted by the other parts of the head remaining undetached from it, so that it sank very slowly and deliberately indeed, affording Queequeg a fair chance for performing his agile obstetrics on the run, as you may say.
There are no more uses of "agile" in the book.
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She is amazingly agile for someone so tall.
Her agility allows her to guard even the quickest ball handlers.