Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

dumbfounder

transitive verb
dumb·​found·​er
variants: or dumfounder \ -​də(r) \

Definition of dumbfounder

: dumbfound she takes possession of it and by her action dumbfounders and antagonizes the family and the countryside — Spectator

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Learn More about dumbfounder

Statistics for dumbfounder

Look-up Popularity

More from Merriam-Webster on dumbfounder

Rhyming Dictionary: Words that rhyme with dumbfounder

Comments on dumbfounder

What made you want to look up dumbfounder? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

yen

Listen to the pronounciation of yen

a strong desire or propensity

Get Word of the Day daily email!

Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games