The antonyms for the word "most frazzled" are calm, composed, relaxed, serene, and tranquil. These words convey a sense of peace and tranquility, contrasting to the feeling of being exhausted or overwhelmed. Calm implies a lack of agitation or disturbance, while composed suggests the ability to maintain one's composure even under stress. Relaxed implies a state of ease or comfort, while serene and tranquil communicate a sense of inner peace and stillness. In all, these antonyms shed light on how one can quickly alleviate stress and feel at ease.