Thunder-struck is a phrase that is typically used to describe a person who is extremely surprised, shocked, or overwhelmed by something. Some common synonyms for this phrase include dumbfounded, stunned, flabbergasted, amazed, astounded, and gobsmacked. These words all convey a sense of utter bewilderment and disbelief, and are often used to describe reactions to unexpected events or news. Other related phrases and expressions that convey similar emotions include "blown away," "taken aback," "knocked for a loop," and "bowled over." Regardless of the specific word or phrase used, the emotion of being thunder-struck is one that is universally understood and experienced by people in a variety of different situations.