The phrase "all shook up" is commonly used to describe a state of anxiety, distress, or confusion. However, there are several antonyms that can be used to describe the opposite of this feeling. These include words like composed, calm, peaceful, relaxed, and serene. To be composed means to have a sense of control and steady emotions, while being calm refers to a state of tranquility and freedom from agitation. Peaceful denotes a state of quietness and serenity, while being relaxed is characterized by a lack of tension or stress. Lastly, an individual in a serene state is described as being untroubled, still, and tranquil.