Antonyms for the word "yellow-brown" include words that represent colors that are opposite to yellow-brown. The color yellow-brown is a mixture of yellow and brown, and some antonyms for this color are blue-green, purple, and pink. Blue-green, also known as aqua, is a color that denotes calm, tranquility, and balance. Purple is a deep, rich color that generally represents luxury, creativity, and sophistication. Pink, on the other hand, is a lighter shade of red that is typically symbolic of love, empathy, and sensitivity. In summary, yellow-brown's antonyms include shades that represent different moods and emotions, making them perfect alternatives for expressing various feelings.