unbarred (adjective)

1. In Greek mythology, Pandora's Box was unbarred, unleashing all the evils upon the world.

2. In the cartoon show, Tom left the door unbarred, and Jerry managed to sneak into the house.

3. During the famous prison break in Alcatraz in 1962, the inmates left their cells unbarred to deceive the guards.

4. In the Gothic novel, the protagonist discovers an unbarred door leading to a secret passage in the old mansion.