He could only hear vaguely what went on the other side of the door.

I vaguely heard Stewart talking to someone on the phone.

She remembered hearing vaguely of such a thing at a conference once.

I had vaguely heard the name, but could not for the instant recall anything about him.

In the background you could vaguely hear another voice directing him.

He vaguely heard Gina speak through his fog of pain.

"Just do as you're told," I vaguely heard him say as we walked into the control room.

She vaguely heard his curses from above her, and they grew more distant.

She vaguely heard Matilda's angry voice, but it came to her from a great distance.

I had vaguely heard of other people doing similar things, but assumed it was either an urban myth or happened very rarely indeed.