adj.无色的，苍白的，无趣的，枯燥的

The water from the tap is completely colourless.
自来水是完全无色的。
The gas is invisible and colourless, making it difficult to detect.
这种气体是无形无色的，很难察觉。
The snow was so pure that it appeared completely colourless.
雪是如此纯净，以至于看上去完全是无色的。
Helium, a noble gas, is odourless and colourless.
氦气是一种惰性气体，无味无色。
The liquid in the bottle is absolutely colourless.
瓶子里的液体完全是无色的。
The air we breathe is transparent, odourless, and colourless.
我们呼吸的空气是透明的，无味的，无色的。
The distilled water has no impurities, hence it's entirely colourless.
蒸馏水不含杂质，因此它是完全无色的。
The spirit used for cooking is generally colourless and odourless.
用于烹饪的酒精通常是无色无味的。
Carbon dioxide, a greenhouse gas, is a colourless and odourless compound.
二氧化碳，一种温室气体，是无色无味的化合物。
The glass of vodka was filled with a clear, colourless liquid.
这杯伏特加里装的是清澈无色的液体。