The word "parti-colored" describes something that is multicolored or having several colors. Some antonyms for this word include monochromatic, unicolor, and homogeneous. Monochromatic refers to something that is of one color or shade. Unicolor describes something that is uniform in color. Homogeneous means something that is of the same kind, nature, or composition. Other antonyms for parti-colored include plain, simple, and uniform. Plain describes something that is lacking in beauty, embellishment, or ornamentation. Simple refers to something that is uncomplicated or easy to understand. Uniform means something that is consistent in color or texture.