This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not armored; not wearing armor

Not armored; specifically, not plated or sheathed with metal as a defense from projectiles: noting ships of war: as, an unarmored cruiser.

adj. used of animals; without protective covering

adj. (used of persons or things military) without protective armor

"Before gunpowder, give me a suit of plate-and-mail, a stout helm, and a whomping big shield, and keep magic out of it, and I'll make mincepie out of unarmored or lightly armored opponents."

scaleless   

pin-grid    hollow-chested    eight-wheeled    unarmoured    light-draught