Adjective:

1. not diluted;

   "undiluted milk"
   "an undiluted racial strain"
   

pureadj.纯的；纯洁的；纯粹的

straightadj.直的；坦率的；正直的；准的；连续的；异性恋的adv.笔直地；直接；坦率地；连续不断地n.直的东西；传统的人；异性恋者

neatadj.整洁的；简洁的；利索的adv.整洁地；利索地

unadulteratedadj.无搀杂的；纯粹的；完全的

unmixedadj.未混杂他物的；纯粹的

dilutedadj.冲淡的；稀释的；无力的动词dilute的过去式和过去分词.

1. Essential oils should never be used undiluted on the skin.
   精油绝对不能未稀释,就应用到皮肤。
2. I looked back on that time with undiluted pleasure.
   我在回顾那段时间时，兴味仍不减当年。