Soured milk, also called curdled milk, has a distinct sour taste and smell that can be off-putting to some people. If you're looking for alternative ways to describe this type of spoiled dairy product, you could use words like rancid, spoiled, or sour milk. Other synonyms can include clabbered milk, soured cream, buttermilk, kefir, or yogurt. Rotten, off, and turned are also frequently used to describe milk that has gone bad. It's important to note that consuming spoiled milk can be harmful, so it's recommended to avoid it.