embarrassed silence
awkward silence
stunned silence

There was a stunned silence from the other end of the line.

There was stunned silence in the room for a moment.

And what they saw brought them all to stunned silence.

He took her hand, and they sat there for a moment in stunned silence.

They'd just sat for a long time in stunned silence.

A stunned silence had held the court a long moment.

And I sat there in a kind of stunned silence.

After a moment's stunned silence, the men began to plan for the coming attack.

For a moment there was a stunned silence on the line.

The army of the West was on its feet again, watching, in stunned silence.