By the end of the book, Ivan has become mentally unstable.

"The economy in the past months has become ever more unstable," he said.

As you already know, the planet is becoming very unstable.

By 1320, the situation in England was again becoming dangerously unstable.

However, in the vast majority of cases, nobody knows why the bladder has become unstable.

Well, she had reacted by becoming emotionally unstable for a while.

When you see a sun going off center, it is a sure sign that the system has become unstable.

Maybe a competitive technological community could only reach a certain point before it became unstable and destroyed itself.

However, Long's tower became unstable and was removed in 1916.

The ride had become unstable and would need a complete track replacement.