Milkwhite, also known as milky white, is a color that signifies purity, innocence, and peace. However, there are quite a few antonyms that suggest the opposite of these attributes. For instance, black may seem like an obvious opposite, as it commonly associates with darkness, evil, and negativity. Gray, dusky, and dingy are other antonyms that suggest dullness, dirtiness, and lack of brightness. Similarly, off-white, cream-colored, and ivory reflect a lack of brightness and may hint towards impurity. It's worth noting that these terms are not inherently negative, but their association with milkwhite suggests the opposite of its positive connotations.