The word "decolorized" refers to the process of removing or reducing color from something. The opposite of decolorized could be words like "colored," "dyed," "pigmented," "tinted," or "stained." These words describe the addition or presence of color in an object or substance, as opposed to its removal. For example, a colored shirt has pigment added to it, while a decolorized shirt has had its color removed. Similarly, a dyed fabric undergoes a coloring process to achieve a certain hue, while a decolorized fabric would have its color intensity reduced or eliminated altogether. Understanding antonyms like these helps us better understand the nuances of language and their respective meanings.