impure
adjectiveUK /ɪmˈpjʊə/
US /ɪmˈpjʊr/
Not clean or not mixed with anything else in a good way.
The water in the pond was impure and not safe to drink.
OTHER MEANINGS
2. Mixed with something else, so it is not pure.
The gold in the ring was impure and had other metals in it.
3. Not morally good or honest.
He was warned about his impure motives for helping.
4. In science, containing unwanted substances.
The impure chemical had to be cleaned before the experiment.