non-substantialist
/ˌnɒnsʌbˈstanʃəlɪst/ /ˌnɒnsʌbˈstanʃ(ə)lɪst/ /ˌnɒnsʌbˈstɑːnʃəlɪst/Philosophy rare
noun
A person who holds the doctrine that there is no substance underlying phenomena.
adjective
Advocating the view that the world is without substance.
Origin
Mid 19th century; earliest use found in William S. Hamilton (1788–1856), philosopher. From non- + substantialist.