colourless
in AM, use colorless
1 adj Something that is colourless has no colour at all.
...a colourless, almost odourless liquid with a sharp, sweetish taste.
2 adj If someone's face is colourless, it is very pale, usually because they are frightened, shocked, or ill.
Her face was colourless, and she was shaking...
3 adj Colourless people or places are dull and uninteresting.
We hurried through the colourless little town set on the fast-flowing Nyakchu.