Senile tremor is a condition that affects the elderly, causing involuntary shaking of the hands, head, and other parts of the body. However, there are several antonyms for the term, which signify the opposite of senile tremor. These include stability, steadiness, and control. If a person has a stable or steady hand, they are less likely to experience tremors. Similarly, if they can maintain control over their movements, their body is less likely to shake uncontrollably. Other antonyms for senile tremor include calmness, composure, self-possession, and serenity. Together, these words describe the opposite of the shaking and jerky movements associated with senile tremor.