instability

And Dantès, happy to escape the history and explanation which would be sure to confirm his belief in his friend’s mental instability, glided like a snake along the narrow passage; while Faria, restored by his alarm to a certain amount of activity, pushed the stone into place with his foot, and covered it with a mat in order the more effectually to avoid discovery.

You dare not, you cannot deny that you have been the principal, if not the only means of dividing them from each other, of exposing one to the censure of the world for caprice and instability, the other to its derision for disappointed hopes, and involving them both in misery of the acutest kind.”