The word "most abiogenetic" implies a high degree of spontaneity or lack of life origin. Antonyms for this word would include more biogenetic, less spontaneous, more designed, more planned, more structured, and more orderly. If something is less abiogenetic, it is more likely to have a clear and intentional origin. For example, a crystal formation that grows in a specific pattern is less abiogenetic than a chaotic and random rock formation. In general, antonyms for "most abiogenetic" describe things that are more deliberate, intentional, or structured, and thus more likely to have a specific purpose or origin.