disconnected

adjective4

1. •
   That is no longer connected.

   • There's no use trying to make a call on the disconnected phone.
2. •
   Feeling a lack of empathy or association with something.

   • I just feel so disconnected from people living on the other side of the world.
3. •
   Incoherent; disjointed.
4. •
   That can be partitioned into two nonempty subsets which are both open and closed.