World English Dictionary
colourless (ˈkʌləlɪs)
1.  without colour
2.  lacking in interest: a colourless individual
3.  grey or pallid in tone or hue
4.  without prejudice; neutral

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for colourless
Hemocyanin is colourless when deoxygenated and dark blue when oxygenated.
As it is colourless and odorless, it has been described as very easy to add to drinks.
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