the GNU version of the Collaborative International Dictionary of English
adj. Destitute of a shield, or of protection.
The Century Dictionary and Cyclopedia
Without shield or protection.
Word Usage
"If an enemy spearman to the right of the over-arm user saw the thrust coming, he would have an easy victim: a man who has stepped with his weight onto his front foot (thus preventing any evasion by footwork) with an exposed shieldless side."