The word "most knife-edged" connotes sharpness and precision, but its antonyms can vary depending on the context. In terms of physical objects, antonyms could include dull, blunt, or rounded. In a figurative sense, "most knife-edged" suggests a high level of intensity or danger, so antonyms could include safe, comfortable, or unremarkable. Other possible antonyms might include flexible, malleable, or pliable. Ultimately, the antonym of "most knife-edged" will depend on the nuances of the situation and the speaker's intended meaning. By considering the context, tone, and connotations of a given term, one can find the perfect antonym to offer balance to any sentence.