: not steady: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : not firm or solid : not fixed in position : unstable                                      
                
                    
        b
    
          
                                          
              
          
                                                      : marked by change or fluctuation : changeable                                      
                
                    
        c
    
          
                                          
              
          
                                                      : not uniform or even : irregular                                      
              
                             
an unsteady pulse
                         
                
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  Merriam-Webster unabridged




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