With this realization, Ryunosuke appears to descend into complete insanity.

Finally the Queen's instability and religious mania degenerated into complete insanity.

He rapidly begins to curse, gamble, and offer mad, coarse ravings of complete insanity.

I must have missed this in my first read though (probably because I was so mad), but it still stands as complete insanity.

After every half-hour, she allowed herself a short phone call or an e-mail session to save her from complete insanity.

Unless Janet found out, in which case he'd plead complete insanity.

The news that a nuclear strike couldn't be recalled struck him as complete insanity.

Only the fact that he'd already suspected as much saved him from the black, yawning pit of complete insanity.

I'm sure she thinks she is drifting into complete insanity.

But in his sinking heart he understood that yet again he had allied himself with complete and unpredictable insanity.