Antonyms for the word "most assailing" would include terms such as peaceful, gentle, calm, tranquil, and soothing. These antonyms imply a state of quietness, relaxation, and non-confrontation. They may evoke a sense of serenity or even contentment, and are often used to describe physical environments, emotions, or personalities that are not aggressive or hostile. These terms can also be applied to situations where there is no conflict or confrontation, whether it's in personal relationships or in public discourse. In contrast to "most assailing," these antonyms promote a sense of harmony and cooperation, encouraging individuals to interact with one another respectfully and peacefully.