"Dumfound" is a verb that means to astonish or bewilder someone. There are several synonyms for this word, including amaze, astound, flabbergast, stun, and surprise. All of these words describe a feeling of shock or surprise that someone experiences when they encounter something unexpected or unbelievable. Other synonyms for "dumfound" include stump, perplex, and confound, which describe a state of confusion or uncertainty. Regardless of the word used, the intent is to express the overwhelming feeling of surprise or astonishment that can leave someone momentarily speechless. Using synonyms can help add variety and depth to your writing while conveying the same meaning.