To make impure or inferior by deceptively adding foreign substances
To avoid giving toddlers too much sugar, adulterate their juice with water.
I will not adulterate my schedule by filling it with unimportant tasks.
Kate is careful not to adulterate her professional reputation by making poor choices on social media.
To lower the concentration of the chemical solution, adulterate it with distilled water.
Some wedding reception hosts will adulterate the alcoholic beverages to make the event safer.