When it comes to describing a lack of color, there are several synonyms that can be used to capture the absence of hue and vibrancy. One common expression is "colorlessness," which describes a neutral or monochromatic appearance, lacking any hues or tones. Another expression is "greyed-out," referring to a dull, muted look that lacks vividness or brightness. "Bleak" and "drab" also describe the absence of color and suggest a sense of dreariness or lifelessness, while "pale" and "washed-out" imply a faded or diluted appearance. Ultimately, the choice of synonym may depend on the context, tone and intention of your writing, in order to accurately convey the desired message.