De-colorized, also known as decolorized, refers to the process of removing or reducing color from a substance. The antonyms for de-colorized vary depending on the context in which it is used. For example, if de-colorized is used to describe clothing, the antonym would be "colored" or "dyed." For artwork, "vibrant" or "colorful" would be appropriate antonyms. In chemistry, "colored" or "pigmented" would be antonyms. In general, any word that conveys the opposite meaning of de-colorized could be considered an antonym.