More nonplussed is a phrase that means to confuse or perplex someone even more than before. The antonyms for nonplussed would be words that describe clarity or understanding. For instance, the words certain, decisive, certain, and confident could express the opposite of confusion or perplexity. Synonyms for these words could be words like knowledgeable, sure, and determined. In any case, using antonyms for more nonplussed could help in contextualizing the word better or express a different emotion entirely. Whatever the case may be, using antonyms for more nonplussed can create a more accurate and more precise understanding of the word's meaning.