1. Color:
* Black and white: If hue refers to color, its antonym could be black and white, monochromatic, or achromatic.
* Absence of color: You could also use absence of color or colorless.
2. Appearance:
* Form: If hue refers to a general appearance, the antonym could be form, shape, or structure.
3. Shade:
* Tint: If hue refers to a shade of a color, the antonym could be tint, tone, or shade.
To find the most appropriate antonym, you need to consider the specific context in which "hue" is used.