szarpiący in inglese:

He could hear whispering and scuffling on the other side of the door.

He made some jerky movements that he couldn't control.

Their jerky performance doesn't stand a chance against ours.

gnawing doubts

Watching a dog gnaw at a big bone. That gnawing pain in her stomach

I didn’t break the piñata; I don’t think I even hit it—the adult who was tugging at the rope from which the piñata was suspended to “make the game more challenging” saw to that.