Most all-embracing refers to the most comprehensive or inclusive category or group. The antonyms for this phrase could vary depending on the context of usage. However, some possible antonyms for the term "most all-embracing" include exclusive, limited, narrow, particular, and exclusive. They refer to something that's not inclusive, not widely encompassing, and limited in scope or variety. For example, a specialized training program may focus on a narrow field of study, which is the opposite of a most all-embracing one that covers multiple disciplines. In summary, identifying the correct antonym for most all-embracing depends on the context of usage.