/ stʌn; NAmE / verb ( -nn- ) [ vn ]
1.
to make a person or an animal unconscious for a short time, especially by hitting them on the head
SYN knock out :
The fall stunned me for a moment.
The animals are stunned before slaughter.
2.
to surprise or shock sb so much that they cannot think clearly or speak
SYN astound ➡ note at surprise
3.
to impress sb very much
SYN amaze :
They were stunned by the view from the summit.
► stunned adjective :
She was too stunned to speak.
There was a stunned silence when I told them the news.
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WORD ORIGIN
Middle English : shortening of Old French estoner astonish.