When it comes to antonyms for the word "most patterned," there are several options that can be used. Some of the antonyms for this term include unpatterned, plain, unadorned, unembellished, and simple. Unpatterned means without a particular design or pattern. Plain refers to something unadorned or without any decorative elements. Unadorned and unembellished both mean lacking decorative details or embellishments. Finally, simple refers to something without any complexities or added features. These antonyms can be used interchangeably to convey the opposite meaning of "most patterned.