What does mortally offended mean?

"Mortally offended" refers to a strong emotional reaction, typically involving deep hurt or anger, as if the offense were so severe it could lead to a figurative death or destruction of one's dignity or pride. It suggests that the person feels profoundly insulted, often implying that the offense is irreparable and has significant personal implications. This phrase highlights the intensity of the feelings involved rather than a literal interpretation of mortality.