Synonyms: jerk, jerking, jolt, saccade
Definition: an abrupt spasmodic movement
Similar words: motility, motion, move, movement
Definition: a change of position that does not entail a change of location
Usage: the reflex motion of his eyebrows revealed his surprise; movement is a sign of life; an impatient move of his hand; gastrointestinal motility
Synonyms: jerking, jerky, arrhythmic
Definition: lacking a steady rhythm
Usage: an arrhythmic heartbeat
Similar words: unsteady
Definition: subject to change or variation
Usage: her unsteady walk; his hand was unsteady as he poured the wine; an unsteady voice