Dumbstruck (adjective)

1. Unable to speak or react due to surprise, shock, or amazement.
2. Stunned into silence.

Origin:

The word "dumbstruck" is formed by the combination of the words "dumb" meaning "unable to speak" and "struck" meaning "hit or affected" which is the past participle of the verb "strik.e"

Examples:

1. He was left dumbstruck by the news of his promotion.
2. She was dumbstruck when she saw the size of the diamond.
3. The audience was dumbstruck by the magic trick.
4. He was dumbstruck by her beauty.
5. I was dumbstruck when I heard the news of her death.