The word "colorise" means to add color to something, but there are a few antonyms for this term. One of the antonyms is "monochrome," which refers to black and white or shades of a single color. Another opposing word is "bleach," which means to remove color or whiten a surface. Other antonyms for colorise include "pale," "drab," "faded," "dull," and "grey." While colorisation can enhance an object's appeal in various circumstances, there are plenty of reasons, such as aesthetic preference or symbolism, to seek out alternative options.