Growing worse is a commonly used phrase that describes a situation where things are getting progressively worse. However, there are several synonyms that can be used in place of this phrase. One of the most common synonyms is "deteriorating", which means that something is becoming progressively worse over time. Another synonym for growing worse is "degrading", which refers to a situation where something is losing its quality or becoming less valuable. "Declining" is another synonym that is often used to describe a situation where things are getting worse. These synonyms can be used interchangeably to convey the same meaning and help to add variety to your writing.