He viscerally disliked the proposal without being able to pinpoint why.

viscerally 来自名词 viscera（内脏），加上后缀 -ally 构成副词。viscera 指身体内部的器官，特别是腹部器官。viscerally 引申为"发自内心地、本能地"，形容一种强烈而直接的生理或情感反应。