thrill, tremor, affright, trepidation, shudder, shaky, misgiving, frisson, chill, panic, timidity, oscillation, rickety, shiver, quiver, wonky, precarious, dread, vibration, unsteady, horror, apprehension, shakiness, awe, dismay, consternation, palpitation, terror, wobbly, fright, fear, tingle, disquietude, vibe
agitated (part of speech: adjective)
shaken, shuddering, agitated, skittish, quivering, upset, jumpy, jerky, disquieted, palpitating, shaking, nervous, quaking, quavering, uneasy, twitching, perturbed, feverish, writhing, wobbling, jittery, churned, unquiet, convulsive, disturbed, distraught, twitchy, restless, troubled, jarred, fluttered, shivering, erratic, spastic
oscillating (part of speech: verb)
pulsing, swaying, throbbing, bobbing, seesawing, wagging, tottering, fluctuating, beating, teeter-tottering, vibrating, oscillating, radiating, alternating, pulsating, undulating, ticking, vacillating, staggering, rocking
flickering (part of speech: verb)
- I sat watching his trembling fingers rolling the papers in an absent silence. - "To-morrow?", Victoria Cross.
- There were fears and trembling as far north as Indianapolis. - "Raiding with Morgan", Byron A. Dunn.
- " So it appeared, by your trembling," said the young lady. - "The Adventures of Roderick Random", Tobias Smollett.