1
                    as in difficult
                                                
              
          
                                                      requiring considerable physical or mental effort                                       
              
                             an exceptionally challenging brainteaser                         
                
                                                                                                                                                                                                                    
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              Antonyms & Near Antonyms
2
                    as in demanding
                                                
              
          
                                                      requiring much time, effort, or careful attention                                       
              
                             a challenging test designed to whittle down the number of contestants                         
                
                                                                                                                                                                                                                    
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Antonyms & Near Antonyms
1
                    as in questioning
                                                
              
          
                                                      to demand proof of the truth or rightness of                                       
              
                             don't hesitate to challenge any statement that generalizes about people                         
                
                                                                                                                                                                                                                                                              
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2
                    
                  3
                    as in requiring
                                                
              
          
                                                      to have as a requirement                                       
              
                             having to put up with an overbearing boss challenges forbearance                         
                
                                                                                                                                                                                                                                                              
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Antonyms & Near Antonyms
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  Merriam-Webster unabridged




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