Ruby-red is a brilliant shade of red that is deep, bold, and rich. When we think of antonyms for the word "ruby-red," we can imagine a range of colors that are pale, pastel, and muted. These might include colors like baby blue, powder pink, light yellow, or mint green. Other antonyms could include darker, cooler shades like navy blue, emerald green, or charcoal grey. Alternatively, we could think of antonyms in terms of texture or appearance, such as smooth vs. rough, shiny vs. matte, or solid vs. transparent. Ultimately, the antonyms for ruby-red will vary depending on the context, mood, and vision we have in mind.