When someone is sentient, but their actions and behaviour signal to the opposite, as if they're just a body obeying
chemistry.
Like doing things only out of instinct, or only doing or focusing on what feels
good, often disregarding anything else.
This guy has talked about and done nothing but eating
fast-food . He's 25, lives with his
parents, and still only does that.
He's a morally dead
fatass.