Someone who is a total vegetable, lacking any drive, emotion, or spirit. It describes a person who just exists without enjoying life or showing any feelings, as if they were heartless.
A rock: it does not move, it does not feel, it does not grow, it is nothing.
Refers to someone or something that lacks life, movement, or expression. For all practical purposes, it describes someone who is completely passive, boring, or unresponsive, similar to a vegetable.
It is something simple that has no life: for example, a vegetable is a ser inerte.