To sever or interrupt a connection.

Of a person, to become detached or withdrawn.

To remove the connection between an appliance and an electrical power source.

That is no longer connected.

“There's no use trying to make a call on the disconnected phone.”

Feeling a lack of empathy or association with something.

“I just feel so disconnected from people living on the other side of the world.”

Incoherent; disjointed.