To fill with astonishment and perplexity; confound. See Synonyms at surprise.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "dumbfound" in a sentence
"My guess is that harold has a low "dumbfound" threshold ..."
"(I am not sure about this I think the only thing that might 'dumbfound' Australians is a rise in interest rates."
"Start taking Penis Enlarge Patch and dumbfound her with your size."