Antonyms for the term "chief ingredient" can be numerous, depending on the context. For instance, if the term refers to cooking, antonyms can be "subordinate ingredient" or "secondary ingredient". Other antonyms can be opposite in terms of the role or importance of a particular item or phenomenon. For example, antonyms can be "minor component", "inconsequential element", or "trivial matter". If we consider "chief ingredient" as a metaphor, antonyms may involve "counter-initiative," or "oppose the main component." This can be used in contexts where the primary factor, substance, or element is on the negative side, i.e., poison or poison apples that need to be overcome.