IPA: /ˈkʌl.ər.ləs/
KK: /ˈkʌlɚləs/
Having no color or brightness; often used to describe something that appears plain or dull.
The water in the glass was colorless and clear.
Colorless → It is formed from "color" (from Latin "color", meaning hue or appearance) and "-less" (meaning without). The word "colorless" means without color or lacking hue.
Think of 'color' as the hue that something has, and '-less' means without — so colorless means something that has no color.