The antonyms for the word "most low-pressure" are: intense, high-pressure, demanding, stressful, difficult, challenging, onerous, arduous, tough, exhausting, and overwhelming. These antonyms suggest a state of heightened activity, pressure, and tension, where one is expected to perform at a high level of competence and efficiency. In contrast, "most low-pressure" represents a relaxed and easygoing atmosphere, where there are fewer expectations and the pace of work is slow and comfortable. This is often associated with leisure activities, such as vacations, weekends, or hobbies, where people can unwind and recharge their batteries after a period of intense activity.