Colorfast is an adjective used to describe a material that does not fade or lose its color easily. Its antonyms, or words with the opposite meaning, are words that describe materials that fade, lose their color or bleed. Some of the common antonyms for colorfast include unstable, fading, bleeding, and dissolving. Unstable material quickly loses color, fades or changes in the sun, heat or from frequent washing. Fading materials lose color over time or due to environmental factors. Bleeding materials release color when in contact with water or other materials. Finally, dissolving materials lose color when they come into contact with moisture.