misestimate
verb
                                                                                                                            
                                                            mis·es·ti·mate
                    
                                                                                                              
                                                                                                                                  ˌmis-ˈe-stə-ˌmāt  
                                                      
                                                          
            
            
              misestimated; misestimating            
        
    
                                
              
          
                                                      : to estimate (something) wrongly                                      
              
                             
He reopens one of the epic disputes of the cold war, namely whether the C.I.A. misestimated Soviet military and economic strength in the 1970's …— Philip Taubman
Philip Taubman
                         
                
                    
                                                      misestimate
                        
                                      noun
                                                                                                                                  
                        
                        
     plural misestimates
                                                            
          
         
                        His misestimate was big but inconsequential, at least in the short term.    
        
        
            — Ross Ramsey
Ross Ramsey          
  
              
                                                      misestimation
                        
                                      noun
                                                                                                                                  
                        
                        
     plural misestimations
                                                            
          
         
                        a serious misestimation of the charges    
  
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  Merriam-Webster unabridged




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