A "piece of action" refers to an exciting or intriguing situation or event. The antonyms for this phrase would be words that indicate a lack of action, excitement or movement. These words include dullness, inactivity, quietness, stillness, and tranquility. When life is not full of "pieces of action," it can feel monotonous and uneventful. However, taking moments to appreciate the calm and peaceful moments in life can also bring a sense of contentment and serenity. It's all about finding balance between the excitement and the calm.