But when I tried to get up I felt too weak to stand.

NEWYORKER: Wakefield

The next morning, my fever had subsided, though I still felt weak, not as steady on my feet as before.

NEWYORKER: The House Behind a Weeping Cherry

For a moment I felt like I had taken a real job working for a big corporation and the thought made me weak-kneed.

FORBES: Congress Motivated By Fear, Incompetence... Just Like Big Business!