Doddering

You great fat, blasted, blear-eyed, blundering, thundering, brainless, God-forsaken, doddering, damned fool!

Treat the doddering old fool with sympathy.

She treats him not as a doddering old fool but as a man hampered in his movements by injury.

Now that he was next in line to the minister of state security himself, an 82 year old man whose dodderings Fang graciously covered up to save everyone's face, Fang had a huge problem.