Something that is egregious stands out, but not in a good way — it means "really bad or offensive," like a tattoo on a man misspelling his girlfriend's name.
"My massage therapist gave me bruises," someone complained recently on Twitter, asking, "When does it cease to be deep tissue massage therapy and become egregious and unabashed manhandling?" An egregious error is hardly forgivable. Some synonyms are shocking, appalling, and intolerable. The word has made a 180-degree turn from its original sense in Latin, when it meant "exceptionally good." Word historians have speculated that the negative usage was originally meant to be ironic, but it is the only sense that has survived. Be careful not to use it to mean "outstanding," since no one wants to be called egregious.