wabble

The chair seemed to wabble beneath him.

It was the iron clamp or prop on the pedestal, stuck on to keep the wretched image upright when it began to wabble, I suppose.

I don't know how far you've gone with your hellish doubts, but I've been listening to the hedging way you answer questions in Sunday School, and I know you're beginning to wabble.

"We've been back to the Castle less than an hour, I'm covered wi' the sweat and dust of two days in the saddle, and so tired my knees wabble, and yet ye think I've gone straight out to seduce a maid of sixteen?"