Usually means: Confuse greatly; astonish; render speechless.
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We found 10 dictionaries that define the word dumfounder:

General (10 matching dictionaries)
  1. dumfounder: Merriam-Webster
  2. dumfounder: Collins English Dictionary
  3. dumfounder: Wordnik
  4. dumfounder: Wiktionary
  5. Dumfounder, dumfounder: Dictionary.com
  6. Dumfounder: Online Plain Text English Dictionary
  7. dumfounder: Webster's Revised Unabridged, 1913 Edition
  8. Dumfounder: AllWords.com Multi-Lingual Dictionary
  9. dumfounder: FreeDictionary.org
  10. dumfounder: TheFreeDictionary.com

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Definitions from Wiktionary (Dumfounder)

▸ verb:  Alternative form of dumbfounder. [(transitive) To dumbfound.]

Similar:
dumbfounder, dumfound, dumbfound, dumbify, dizzify, dumben, discomfit, confound, befuddle, disorient, more...

Opposite:
enlighten, clarify, explain, elucidate

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Similar:
dumbfounder, dumfound, dumbfound, dumbify, dizzify, dumben, discomfit, confound, befuddle, disorient, more...

Opposite:
enlighten, clarify, explain, elucidate



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