palpitation

A trembling or shaking.

Irregular, rapid beating or pulsation of the heart.

The act of palpitating, throbbing, quivering, or trembling; specifically, a beating or pulsation of the heart, particularly a violent and unnatural beating or pulsation, such as is excited by violent action, by emotion, or by disease.

A rapid pulsation; a throbbing; esp., an abnormal, rapid beating of the heart as when excited by violent exertion, strong emotion, or by disease.

An abnormal awareness of the beating of the heart.

a rapid and irregular heart beat

a shaky motion