The word "unpropitious" basically implies unlucky or unfavorable conditions. And if we look for its antonyms, we find that the most appropriate ones would be "auspicious," "favorable," and "propitious." These antonyms are the opposite of the negative connotations associated with the word "unpropitious." They indicate good fortune, luck, and favorable conditions for any situation. These words can be applied in different contexts, including personal, professional, and social spheres. In summary, the antonyms for unpropitious denote favorable, positive, and prosperous aspects of life. It is always better to focus on the positive side of things and bring auspiciousness into our lives.