Webster's English Dictionary

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nonplus

Cross references:
  1. puzzle                
 
1. non.plus \(')na:n-'pl*s\ n or non.plus.es or non.plus.ses [L non plus no 
   more] pl  : a state of bafflement or perplexity : QUANDARY 
2. nonplus vt or non.plussed also non.plused;  also non.plus.sing;  also 
   non.plus.ing : to cause to be at a loss as to what to say, think, or do : 
   PERPLEX