agitating, bucketing, convulsing, jerking, jiggling, joggling, jolting, jouncing, juddering(chiefly British), quaking, quivering, shaking, shuddering, wobbling(also wabbling)
rocking, swaying, swingingchattering, quavering, shivering, thrilling, tremblingtwitchingdoddering, waveringflickering, fluctuating, fluttering, oscillating, undulating, wavingbeating, palpitating, pit-a-patting, pitter-pattering, pulsating, pulsing, throbbing