unprotected
adj.not covered or kept safe from harm, weather, or danger. You use this when something has no shield or help to stop it from being hurt.
adj.lacking a physical or legal barrier against harm, damage, or exposure. Often used predicatively after 'be' or 'remain' to describe a state of vulnerability.
“You should not leave your skin unprotected in the sun.”
“The coastal village remained unprotected from the storm because the sea wall was still under construction.”
“Without a robust firewall and encrypted connection, your sensitive personal data remains unprotected against sophisticated cyberattacks that target public networks.”
Often used with the preposition 'from' or 'against' to specify the source of danger.
From un- + protected.
From unprotect + -ed.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.