The word achromous refers to something that lacks color or is colorless. Some antonyms for this word include colorful, vibrant, pigmented, tinted, and hued. These words describe something that is full of color or has a variety of color, the opposite of achromous. Other antonyms for achromous are dyed, colored, and stained, which refer to something that has been deliberately colored or stained to create a specific effect. Whatever the antonym, they all emphasize a particular aspect of color that is missing in achromous, making them useful to learn for expressing ideas about color and its absence.