The phrase "having quivers" refers to the sensation of shaking or trembling, usually as a result of fear or excitement. Antonyms for this phrase include being calm, still, steady, composed, serene, assured, confident, and collected. When one is composed, they are in control of their emotions and able to remain calm even in the face of adversity. On the other hand, when one is having quivers, they may be paralyzed with fear, unable to act or make sound decisions. By understanding the antonyms of "having quivers," one can strive to maintain a sense of calm and composure in challenging situations.