IPA: /dɪˈkoʊləd/
KK: /dɪˈkoʊlɚd/
Having lost its color or brightness, often due to bleaching or fading.
The decoloured fabric looked old and worn out.
Decoloured → It is formed from "de-" (meaning down or away) and "colour" (from Old French *color*, meaning hue or tint) and the suffix "-ed" (indicating a past action). The word "decoloured" means to have had its color removed or faded away.
Think of 'removing' ('de-') a 'hue' or 'tint' ('colour') — that's why decoloured means something that has lost its color.