Collocations for stunned - adj.

appear, be, feel, look, seem, sit, sound, stand
Morton stood stunned, unable to believe his ears.

leave sb
Leaving them all stunned, she walked out of the bar.

deeply | absolutely, completely, quite | almost | a bit, a little, slightly, somewhat | briefly, momentarily

at
They seemed stunned at his outburst.

by
She was a bit stunned by the news.

with
stunned with grief