1. (noun) an abrupt spasmodic movement

• jerk
• jolt
• saccade

2. (adjective) lacking a steady rhythm

• arrhythmic
• jerky

1. (noun) an abrupt spasmodic movement

• motility
• motion
• move
• movement

1. (adjective) lacking a steady rhythm

• unsteady

1. (noun) an abrupt spasmodic movement

• arrhythmic
• jerky
• buck
• hitch
• jerk
• bumpy
• jolting
• jolty
• jumpy
• rocky
• rough
• flick
• jerk
• jar
• jolt
• jerk
• jerk
• twitch
• twitch
• jerk
• yank
• jerk
• jerk
• twitch
• twitch

2. (adjective) lacking a steady rhythm

• arrhythmia
• cardiac arrhythmia
• fitfulness
• jerkiness
• jerk
• jolt
• saccade