The term 'isn't colorfast' refers to a fabric or dye that does not hold its color when exposed to water, sunlight, or other elements. This can be seen in the crossword solutions of 'RUNS, ' 'bleeds, ' and 'fades.' When a fabric or dye RUNS, it means that the color has spread out and bled into other areas. Fading occurs when the color of the fabric or dye has become duller or lighter due to exposure to light or other elements. All of these terms indicate that the fabric or dye is not colorfast.