Having shakes refers to uncontrollable trembling or shivering that can occur in one's body. The antonyms, or opposites, of having shakes would be stability, steadiness, and calmness. Stability suggests a firm and steady condition that is free from any kind of shaking or trembling. Similarly, steadiness implies a sturdy and reliable state that is not subject to sudden movements or vibrations. Finally, calmness denotes a peaceful and serene condition where there is no nervousness, excitement, or agitation. Therefore, the antonyms of having shakes reflect a state of control, composure, and tranquility, which are crucial for maintaining balance and harmony in one's physical and emotional well-being.