1. (noun) a shaky motion

• quiver
• quivering
• shakiness
• shaking
• trembling
• vibration

1. (noun) a rapid and irregular heart beat

• symptom

2. (noun) a shaky motion

• motion

1. (noun) a shaky motion

• tremolo
• tremor

1. (noun) a rapid and irregular heart beat

• flutter
• palpitate
• palpitate

2. (noun) a shaky motion

• didder
• shake
• palpitate
• palpitate
• palpitate
• quake
• quake
• quake
• quiver
• quiver
• quiver
• rickety
• shaky
• wobbly
• wonky
• shaky
• shivering
• trembling
• tremble
• vibrate
• vibrational