The word "spasmic" refers to something that is characterized by spasms, convulsions or sudden involuntary muscular contractions. Some synonyms for "spasmic" include twitching, convulsive, jerking, involuntarily contracted, and uncontrolled muscular contractions. Other similar words to describe such movements include erratic, jumpy, spasmodic, and quivering. These terms describe movements that are sudden, unexpected, and involuntary, indicating a lack of control over one's actions. Such movements can occur due to various factors like stress, anxiety, or neurological disorders. In conclusion, these synonyms for the word "spasmic" are often used to describe irregular, jerky movements that are involuntary and indicate a lack of control over one's body.