When searching for antonyms for the term "most contracted," the antonyms that come to mind are "most expanded" or "most extended." These antonyms refer to the opposite of what being contracted implies, which is a reduction in size, volume or space. If something is expanded or extended, it is larger, wider or longer than it was previously. These antonyms can apply to various contexts, including medicine, language or economics. For example, "expanded" could describe a lung capacity test result, while "extended" could refer to a business that is growing its services to reach a wider audience.