unprotected — to defend or guard from attack, invasion, loss, annoyance, insult, etc.; cover or shield from injury or danger.
shield — a broad piece of armor, varying widely in form and size, carried apart from the body, usually on the left arm, as a defense against swords, lances, arrows, etc.
vulnerable — capable of or susceptible to being wounded or hurt, as by a weapon: a vulnerable part of the body.
wide open — opened to the full extent: a wide-open window.