What is the definition of dumbfounded?

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It means shocked, or amazed, to the point of speechlessness.
Being dumbfounded is an extreme form of being surprised or caught off guard.
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How do you use the word dumbfound in a sentence?

The word dumbfound can be interchanged with such words as surprised or shocked. For example, Billy was surprised when his parents bought him a car for his birthday.

Is dumbfounded an adjective?

Yes it is. From the outdated meaning of dumb (speechless),dumbfounded means rendered unable to act or speak, as when startledor awed.