1
                    as in challenge
                                                
              
          
                                                      something that requires thought and skill for resolution                                       
              
                             the problem of world hunger                         
                
                                                                                                                                                                                                                    
        Synonyms & Similar Words
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              Antonyms & Near Antonyms
2
                    as in question
                                                
              
          
                                                      an interrogative expression often used to test knowledge                                       
              
                             there were only 10 problems on the exam, but they were all challenging                         
                
                                                                                                                                                                          
        Synonyms & Similar Words
Antonyms & Near Antonyms
as in troublesome
                                                                                                                                                    
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  Merriam-Webster unabridged




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