There are many synonyms for the phrase "easily upset". Some of the most common ones include "sensitive", "touchy", "irritable", "moody", "emotional", "volatile", "fragile", "high-strung", "prone to agitation", and "quick to take offense". These words all suggest someone who is easily triggered by external factors or prone to reacting strongly to small incidents. While being easily upset can be a natural trait or temporary state, it can also be a sign of underlying emotional or mental health issues that may require professional help. It's important to recognize when one is prone to being easily upset and learn effective coping mechanisms to manage these emotions.