Unguarded

He is utterly unguarded.

Seagulls have been known to fly off with whatever a person might be eating if it is left unguarded.

The country has an unguarded coastline that's more than 3,000 kilometers in length and open borders.

The place was unguarded.

They leave the boats unguarded.

The boats were unguarded.

The unguarded gatehouse was soon taken by the invading army.

I let out her secret in an unguarded moment.