Nonplussing is a term that refers to a state of confusion or puzzlement. There are many different synonyms for this term that can be used depending on the context and tone of the conversation. These synonyms include perplexing, baffling, confounding, mystifying, befuddling, and bewildering. Each of these words has its own unique spin on the idea of nonplussing and can be used to describe the state of being confused in different ways. Ultimately, when trying to describe a situation where you feel nonplussed, it's important to choose the right word to convey your message effectively.