become insane

He went to Madam Dupin, and told her and everybody he met, that I had become insane.

In 1792 he assumed the reins of government in name of his mother Queen Mary I., who had become insane.

He was the father of the Duchesse de Lvis and the last of his name, having in 1842 lost his son who had become insane.

Many women would have given it up and would have fallen into a state of listless indifference; some would have become insane.

One of his fancies used to be that everybody else was insane, or just about to become insane.