1. A contamination according to ritual beliefs: Many of those in the church felt impureness during the preacher's sermon as he pointed out the need for everyone to be more conscious of his or her behaviors and beliefs.
2. The condition of being combined with something else, usually producing an inferior quality: The impureness in the old vintage home was indicated by the different styles of architecture that didn’t match each other.
3. The state of being mixed with contaminating material: The people in the village couldn’t drink the water in the basin because of its impureness due to bad bacteria.
4. Etymology: from Latin impurus, from in-,"'not" + purus, "pure".