His animistic beliefs made him think that trees and stones possess souls.

animistic 是由名词 animism（万物有灵论）加上形容词后缀 -tic 构成的形容词。animism 来自拉丁语 anima（灵魂、生命），指认为自然界万物都有灵魂的信仰体系。animistic 意思是"万物有灵论的"。