There are a number of synonyms that can be used to describe someone who is "over-sensitive" or prone to reacting in an overly emotional or sensitive manner. Some alternative phrases might include "hypersensitive," "easily offended," "reactive," "fragile," "temperamental," "vulnerable," "thin-skinned," or "brittle." While these terms can be used to describe a wide range of personality types and behaviors, they all convey a sense of heightened sensitivity or reactivity that may impact one's ability to navigate social situations or maintain healthy relationships. Ultimately, understanding and managing one's over-sensitivities can be an important aspect of personal growth and emotional intelligence.