Definition

To surprise or shock someone so much that they are unable to respond or react.

Example

The unexpected news dumfounded everyone in the room.

Tense Forms

Conversation

Did you hear the news about Sarah's promotion?

Yeah, it really dumfound me! I didn't see that coming at all.

Right? I was dumfound too when I found out.

Me too! She totally deserves it, though.

Synonyms & Antonyms

Root Explanation

Dumfound → It is formed from 'dum' (meaning to stun or make speechless) and 'found' (from Old English 'fundian', meaning to establish or discover). The word 'dumfound' means to stun someone to the point of being speechless or unable to respond.

Memory Tip

Think of being so 'stunned' ('dum') that you can't 'establish' a response ('found'). This helps you remember that dumfound means to leave someone speechless.

Visually Confused Words