1. with no colour or with no colour added
⇒ pieces of uncoloured glass, ⇒ Your black coffee is composed of black grain and uncoloured water., ⇒ Her hair is an uncoloured dirty blonde.
2. not influenced or biased
⇒ an uncoloured account of what happened, ⇒ a world uncoloured by emotion
Collins English Dictionary. Copyright © HarperCollins Publishers