• flickery, quaking, quaky, quavering, quavery, shaking, shaky, shuddering, trembling, trepidant, vibrant, vibrating
• quakingly, shakily, shudderingly
• flutter, judder, palpitation, quaking, quiver, shudder, shuddering, thrill, tremble, trembling, tremor, trepidancy, trepidation, trepidity, vibration
• to judder, to shake, shook, shaken