The word "steelplated" refers to something that is covered or reinforced with a layer of steel. Therefore, its antonyms can be words that signify the opposite of this characteristic, such as flimsy, brittle, weak, fragile, delicate, or vulnerable. These terms relate to structures that lack strength, durability, and resistance against impact or force. For instance, a house made of cardboard would be seen as flimsy, while a glass vase is considered fragile due to its delicate nature. In contrast, materials that are not steelplated can be fluid, pliable, flexible, or soft, indicating a lack of rigidity or stiffness, hence making them unsuitable for steelplating.