incommensurable

/ˌɪnkəˈmɛnsərəbəl/
adjective
  1. Unable to be measured or compared by the same standard; having no common basis for comparison.
    • Art and science are often seen as incommensurable fields of knowledge.
    • The two theories are incommensurable because they use completely different assumptions.
    • The values of the two cultures were incommensurable, leading to misunderstandings.