1. bland: bland means lacking in color, luster, or variety, in contrast to variegated.
2. monotonous: monotonous means lacking in variety, repetitive and boring, in contrast to variegated diversity and richness.
3. dull: dull means lack of light, faded or unbright colors, in contrast to the brightness and vibrancy of variegated colors.
4. dull: dull denotes lack of light, faded or dim colors, in contrast to variegated bright and vivid.
5. colorless: colorless indicates the absence of color, in complete contrast to the richness and variety of color in variegated.
6. monochromatic: monochromatic implies that there is only one kind or type, in contrast to the diversity and variation of variegation.
7. mundane: mundane implies ordinary, common, or unexceptional, in contrast to the uniqueness and strikingness of variegated.
8. gloomy: gloomy implies lack of light, dimness, or shadow-covered, in contrast to the brightness and color of variegated.
These antonyms can help you convey the meaning opposite to variegated, but please note that some words may have multiple choices of antonyms, and it is necessary to determine the most appropriate antonym based on the specific context.