1. extremely surprised and confused; unable to speak because of shock or amazement

Examples

• She was dumbfounded by the unexpected news of her promotion.
• The students sat dumbfounded when their teacher announced there would be no final exam.
• He stood dumbfounded in the doorway, staring at the surprise party.
• The audience was dumbfounded by the magician’s incredible trick.
• I was completely dumbfounded when I won the lottery.
• The children were dumbfounded to see snow falling in April.