The phrase "be adjunct" typically means to serve as a supplement or addition to something else. As such, antonyms for this phrase might include terms like "standalone," "complete," "independent," or "unaided." These words imply a sense of self-sufficiency and autonomy that is not present when something is serving as an adjunct. Other antonyms might include terms such as "primary," "essential," "central," or "integral," which suggest that something is not just an add-on, but rather a critical part of a larger whole. By considering these antonyms for "be adjunct," one can gain a clearer understanding of the role that different elements play within a given context.