1. having the mouth wide open, especially in surprise, shock, or amazement
2. showing obvious surprise or wonder

Examples

• The children stood openmouthed as the magician pulled a rabbit from his hat.
• She stared openmouthed at the massive waterfall.
• The audience sat openmouthed during the incredible performance.
• He was openmouthed with shock when he heard the news.
• The tourists gazed openmouthed at the ancient cathedral.
• The students remained openmouthed as their teacher announced the surprise field trip.