The phrase "were rotten" is often used to describe something that is decayed, putrid or spoiled. However, there are a variety of synonyms that can be used to convey the same meaning but with different shades of connotations. Words like "foul", "decomposed", "rancid", "disintegrated" and "decayed" all denote a sense of decay and deterioration. Similarly, "corroded", "spoiled", "mouldy" and "musty" are also used to describe something that is rotten. Each of these synonyms captures the essence of something that is no longer fresh, wholesome or healthy, and serve as viable alternatives for the expression - "were rotten".