"They can publish something very formal next to something completely unhinged," he said.

He was close to coming completely unhinged.

Weeks of imagining his daughter's and brother's awful deaths had completely unhinged him.

Completely unhinged, Black Mask fled back into the burning bedroom.

When we left this June, it was completely unhinged.

Alexandra had the sinking fear that Rhea had come completely unhinged.

In a bid to check my memory is not going completely unhinged, google produces:

And in the Mad Scene, her demeanor was mildly strange rather than completely unhinged.

But at the revelation that his victim and Helen were going to escape him, he became completely unhinged.

Her end shows her to be completely unhinged.