1. extremely surprising or shocking; causing someone to be speechless with amazement

Examples

• The magician’s dumbfounding trick left the entire audience in stunned silence.
• It was dumbfounding to discover that my quiet neighbor was actually a famous author.
• The team’s dumbfounding comeback in the final minutes shocked everyone in the stadium.
• Her dumbfounding ability to solve complex math problems impressed all her teachers.
• The dumbfounding news of his promotion came completely out of nowhere.
• The scientist made a dumbfounding discovery that challenged everything we knew about physics.