"Be thunderstruck" is an expression that describes the feeling of being thoroughly amazed or shocked. While it's a common phrase that we use in our daily lives, there are a variety of other synonyms that can be used in its place. Some of these alternatives include astounded, dumbfounded, flabbergasted, stunned, awestruck, bowled over, struck dumb, gobsmacked, and taken aback. These synonyms help to broaden our vocabulary and provide us with different ways to express our emotions. Whether you're writing a paper, telling a story, or just conversing with friends and family, it's always useful to have an array of words at your disposal to convey your thoughts and feelings.