epiphenomenalistic /ˌɛpɪfəˌnɒmɪnəˈlɪstɪk/ adjective1 •Relating to epiphenomenalism.Here, then, is a simple argument to show that zombist interactionists, even though they deny that epiphenomenalism is actually true, must accept that an epiphenomenalistic world is possible. — 2017 formsmore epiphenomenalistic · most epiphenomenalistic