involuntary shaking of the body or limbs, as from disease, fear, weakness, or excitement; a fit of trembling.

any tremulous or vibratory movement; vibration

tremors following an earthquake.

a trembling or quivering effect, as of light.

a quavering sound, as of the voice.

noun

stillness

noun

agitation , earthquake , flutter , quake , quaking , quaver , quiver , quivering , ripple , shake , shiver , shivering , tremble , trembling , trepidation , upheaval , vibration , wobble , seism , temblor , tremblor , shudder , thrill , tic , twitch , ague , shaking , shock , trembler , vibrating