lost for words

/lˈɒst fɔː wˈɜːdz/

/lˈɔst fɔːɹ wˈɜːdz/

lost for words

temporarily unable to think of what to say or how to express oneself, often due to shock, surprise, or intense emotion

Examples

1. She was gaping at it, lost for words.

2. Mary was lost for words when she was awarded the prize.

3. I was so surprised to see her that I was lost for words.

4. I'm just lost for words so much so that I forgot to tell you guys the capacity.