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- When the Shirriffs came up to the lower one they were dumbfounded; but as soon as they saw how things were, most of them took off their feathers and joined in the revolt.6.8 -- Book 6 Chapter 8 -- The Scouring of the Shire (47% in)
There are no more uses of "dumbfounded" in The Return of the King.
Typical Usage (best examples)