quivering
nounThe act of trembling, wavering, or vibrating; a tremulous shaking.
adjectivePresent participle of 
A motion by which something 
the act of vibrating
nouna shaky motion
The act of trembling, wavering, or vibrating; a tremulous shaking.
adjectivePresent participle of 
A motion by which something 
the act of vibrating
nouna shaky motion