The phrase "more riven" describes a state of being torn or divided, indicating a severe and irreparable rift. The antonym for this phrase would be "united," which suggests a state of cohesion and harmony. Other possible antonyms for "more riven" include "whole," "healed," "integrated," and "unbroken." Conversely, synonyms for "more riven" might include "fractured," "fragmented," "separated," "broken," or "splintered." Depending on the context and intended meaning, these words can be employed to convey different nuances and shades of meaning, allowing writers and speakers to express themselves with precision and clarity.