The word "most reposing" means to be in a state of complete relaxation and rest. Antonyms for this term include words that describe a state of activity or movement, such as hectic, frenzied, restless, or agitated. These words suggest a feeling of uneasiness or busyness rather than calmness and tranquility. Other antonyms for "most reposing" could include terms like anxious, worried, or perturbed, which again convey a sense of unease or discomfort. Ultimately, the opposite of "most reposing" are words that describe a state of mind or environment that is anything but calm and restful.