Antonyms for the phrase "are intrinsic to" could include terms such as extraneous, peripheral, incidental, or superficial. These words suggest that something is not a fundamental part of a particular situation or context. For example, if someone were to say that honesty was intrinsic to their character, an antonym of that might be that deceit was extraneous to their character. Similarly, if someone were discussing the intrinsic qualities of a work of art, an antonym might be that certain elements were superficial to its overall impact. In general, antonyms of "are intrinsic to" imply that something is not an essential or crucial component of a given situation or system.