The antonyms for the phrase "most disintegrated" are quite simple - "unspoiled", "intact", "whole", "complete", and "undamaged". "Unpolluted" and "uncontaminated" can also be used as antonyms in certain contexts. These words carry a sense of wholeness, preservation, and purity of form, while "most disintegrated" indicates that something has broken down over time, lost its integrity or has become damaged beyond repair. It's important to note that the antonyms for "most disintegrated" certainly depend on the object in question - for example, an old building may be "most disintegrated", while a new, modern building may be "unspoiled".