Loppered is a word used to describe milk that has curdled and separated into solids and whey. However, there are many synonyms that can be used to identify this condition of milk. Sour, clabbered, curdled, spoiled, and turned are some common synonyms that can be used instead of loppered. Rancid, rotten, degraded, and putrid are other words that can also describe the state of milk that has gone bad. These synonyms indicate that the milk has undergone a chemical process leading to its deterioration. Loppered or any of its synonyms are not suitable for consumption and should be discarded.