1. comparative form of impure; containing unwanted or harmful substances; not pure
Usage: comparative degree of the adjective 'impure'
2. comparative form of impure; morally or ethically questionable; not chaste or virtuous
Usage: comparative degree; formal or literary usage

Examples

• The water from that well is impurer than the spring water we collected yesterday.
• His motives seemed impurer than those of his colleagues.
• The impurer metals in the alloy made it less durable.
• She accused him of having impurer intentions than he claimed.
• The air quality is impurer in industrial areas compared to rural regions.