colorless

形容词 colorless:

1. lacking in variety and interest
   同义词：colourless
2. weak in color; not colorful
   同义词：colourless

1. Ammonia is a colorless gas with strong smell.
   氨是无色并有强烈气味的气体。
2. Glycerin is a thick sweet colorless liquid.
   甘油是一种很甜且无色的浓稠液体。
3. He has become colorless because of anger.
   他因为生气，脸色苍白。
4. Water is colorless.
   水是无色的。
5. The old man's life became dull and colorless.
   老人的生活变得呆板无趣。

col.or.less

adj.（形容词）
Lacking color.
缺色的
Weak in color; pallid.
色弱的；苍白的
Lacking animation, variety, or distinction; dull.See Synonyms at dull
无精打彩的，乏味的：缺少生气、变化或差别的；乏味的参见 dull

【引伸】
col.orlessly
adv.（副词）
col.orlessness
n.（名词）