Unarmored (adjective)

1. Not protected by armor or any equivalent covering.
2. Not fortified or strengthened.

Origin:

Derived from the prefix 'un-' meaning 'not' and 'armored' meaning 'protected by armor or some equivalent covering.'.

Examples:

1. The unarmored tank was vulnerable to enemy fire.
2. The unarmored vehicle could not withstand heavy attacks.
3. The castle's unarmored walls were easily breached.
4. The unarmored ship was no match for the enemy fleet.
5. The unarmored tree was susceptible to damage from strong winds.