jerkily       
adverb uk/ˈdʒɜː.kəl.i/ us/ˈdʒɝː.kəl.i/
 忽动忽停地;不稳地
in a way that is not smooth and pleasant, but has quick and sudden movements
  He began to dance jerkily. 他开始跳舞,动作并不连贯。 
 The car rolled jerkily to a halt. 汽车摇晃着停了下来。 
 See: jerky
 - More examples
 - They moved jerkily, as if they were puppets on the end of strings.
 - He drove a little jerkily until he got more used to the car.
 - She sank to the floor, crying jerkily.
 - I walked jerkily around the park, shivering.