The phrase "going to ruin" can be used to describe a situation where something is deteriorating or falling into disrepair. However, there are many synonyms that can be used to evoke the same sense of impending doom or failure. These include "declining," "dilapidated," "decaying," "failing," "degenerating," "crumbling," "depressed," "degraded," "dying," and "falling apart." Each of these words may have slightly different connotations, but they all suggest a negative change or outcome. Whether describing a building, a business, or a personal relationship, using one of these synonyms can help to convey a sense of urgency or warning about the situation.