The antonyms for the phrase "chief parts" vary depending on the context in which it is used. If referring to the key or primary components of something, the antonyms could be minor parts, secondary components, or even peripheral elements. However, if "chief parts" refers to the most important or vital aspects of a situation, the antonyms could include trivial details, insignificant factors or irrelevant points. In any case, understanding the antonyms of "chief parts" can help provide a fuller picture of what makes up a whole and can aid in prioritizing what aspects are most important to focus on.