Achroma, also known as colorlessness, is a concept that has various synonyms used to describe it in different contexts. Some of the synonyms for "achroma" include "neutral," "pale," "greyscale," "achromatic," "monochrome," "colorless," "brownish-gray," and "achromic." These words are often used to describe objects or visual media that do not have enough color. For example, black-and-white photographs, grayscale images, and monochrome paintings are considered achromatic because they do not contain enough color. Additionally, these synonyms are commonly used by designers, artists, and photographers to describe color palettes that are dominated by neutral hues, such as white, black, and gray.