1. to make something impure or weaker by adding something of inferior quality

1. made impure or weaker by the addition of something inferior
Usage: formal

Examples

• The company was fined for adulterating their olive oil with cheaper vegetable oils.
• Food inspectors found that the milk had been adulterated with water.
• The wine merchant was caught selling adulterated bottles to unsuspecting customers.
• They discovered the honey was adulterated with corn syrup.
• The scandal involved adulterated medicines that contained harmful substances.
• Pure vanilla extract costs more than the adulterated versions.
• The investigation revealed that several spice companies had adulterated their products.