The word "un-ornamented" refers to something plain or simple, lacking any decorative features. Its antonyms, however, describe a variety of ornate or elaborate characteristics. "Ornamented," for example, refers to something that has been adorned with decorative features, such as patterns, designs, or embellishments. "Extravagant," on the other hand, implies something that is excessively decorative, perhaps even flamboyant in its appearance. "Ornate" is another antonym, indicating something that is highly decorative, perhaps even excessively detailed, while "lavish" denotes something that is rich and luxurious, often characterized by opulence and grandeur. Overall, the antonyms for "un-ornamented" evoke a sense of lavishness and elaboration, often suggesting a highly decorative appearance.