The word "more unartificial" can be rephrased as "less contrived" or "more genuine." Antonyms for this phrase could include "artificial," "fake," or "manufactured." Other antonyms might include "contrived," "pretentious," or "affected." When describing something as "more unartificial," it suggests a natural quality that is not forced or manipulated in any way. In contrast, the antonyms for this phrase evoke a sense of something that is not real, or has been created in a way that is not authentic. For example, using artificial sweeteners in food may be considered the antithesis to using natural sweeteners.