"Jerkier" is a word used to describe sudden and abrupt movements, often with a lack of smoothness or grace. However, there are several synonyms that can be used to convey similar meanings. Some of these synonyms include "jolting," which refers to a sudden and harsh movement, and "jerking," which describes an abrupt pulling or tugging motion. "Spasmodic" is another word that can describe a jerky movement, often associated with muscle spasms or convulsions. Additionally, "choppy" can be used to describe a jerky movement, particularly in reference to water or waves. By using these synonyms, writers can add variety and depth to their descriptions of movement.