nonplus

/ˌnän-ˈpləs/

Latin non plus no more

noun

  1. a state of bafflement or perplexity : quandary

… reducing the young man to a nonplus …

verb

  1. to cause to be at a loss as to what to say, think, or do : perplex

nonplussed by the disclosure

puzzle perplex bewilder distract nonplus confound dumbfound mean to baffle and disturb mentally. puzzle implies existence of a problem difficult to solve. perplex adds a suggestion of worry and uncertainty especially about making a necessary decision.