If something is unconfined, it's free from physical restraint. Unlike chickens in industrial chicken farms, the unconfined chickens raised on real farms get to wander all they want.
Confinement is enclosure, so something that is unconfined has no boundaries or limits. If you're super excited because you just won the lottery, your joy is unconfined. If you think that the world is tumbling into doom, then you are an unconfined pessimist. If you are released from prison after 20 years, it will feel strange and wonderful to be unconfined.
