The antonyms for the term "fail to aid" are many, representing positive and proactive attitudes towards helping others. "Aid" involves assisting, supporting, and providing sustenance or care for those in need. Thus, "succeed in helping" can be a synonym to "aid," and it means to achieve positive results in assisting someone or something. Similarly, "enable," "facilitate," "support," "empower," and "promote" can be antonyms for the term "fail to aid." These words suggest the effectiveness of a helping or assisting process, emphasizing the need for action, empathy, and kindness in promoting well-being and progress.