Unguarded (adjective)

Not protected or watched over; vulnerable.

Origin:

From the word "un" meaning "not" and "guarded" meaning "protected by someone or something".

Examples:

1. The castle was unguarded and easily taken by the enemy.
2. He made an unguarded comment that got him into trouble.
3. She was unguarded in her vulnerability and easy to hurt.
4. The border was unguarded and illegal immigrants crossed easily.
5. The children were unguarded and vulnerable to the predator's advances.