[{"Bold_text": "verb (used with object)", "List Items": ["to render utterly perplexed by something unexpected; puzzle completely:He nonplussed his questioners by answering in riddles.Synonyms: disconcert , confound , confuse , perplex", "to cause to feel indifferent, calm, or unexcited:The shoppers were entirely nonplussed by the disturbance in the street, continuing to gaze at window displays as they strolled along."]}, {"Bold_text": "noun", "List Items": ["a state of utter perplexity:When the protagonist's wife suddenly disappears, he's at a nonplus and fights with two different feelings."]}]