Unlocked (adjective)

Not secured with a lock or code.

Origin:

From un- (not) + locked (secured with a lock).

Examples:

1. The door was unlocked, so I walked in.
2. The car was unlocked, so anyone could have taken it.
3. Please make sure to lock the windows when you leave, it was unlocked last night.
4. The phone was unlocked, so I could access the apps.
5. The safe was unlocked and the money was missing.