The antonyms for the term "more foundational" include superficial, peripheral, irrelevant, and extraneous. These words imply that the subject matter lacks depth or importance in the context of understanding a particular concept. When something is foundational, it provides a solid base for further exploration or building upon, while superficial, peripheral, irrelevant, and extraneous refer to elements that are not necessary or integral to the foundation. Therefore, when attempting to develop a more comprehensive understanding of a specific concept, it is essential to focus on its foundational elements while ignoring the peripheral, irrelevant, or extraneous details.