The Great Gatsby, inviolate

I'd like to know if in the following excerpt from The Great Gatsby, chapter 7, "inviolate" mean "untouchable", "impregnable":

There is no confusion like the confusion of a simple mind and as we drove away Tom was feeling the hot whips of panic. His wife and his mistress, until an hour ago secure and inviolate, were slipping precipitately from his control.

Thank you;