Auspiciousness refers to the likelihood of success and favorable circumstances, but there are a number of antonyms that convey the opposite meaning. Some antonyms for auspiciousness include inauspiciousness, which suggests that things are not likely to go well, and ill-fortune, which implies bad luck or a lack of success. Other antonyms might include misfortune, unfavorable circumstances, or difficulty. While auspiciousness is often associated with positive opportunities and circumstances, it is important to consider the potential barriers or challenges that might prevent success, and to seek out strategies and resources that can help overcome these obstacles.