Rack-ruin is a phrase used to describe something that has been damaged beyond repair. It means that something has been completely broken down, destroyed or ruined. There are many synonyms for rack-ruin that can be used depending on the context or situation. For example, dilapidated, run-down, decrepit, and broken-down can all be used to describe a building or property that is in a state of disrepair. Similarly, for describing a person who is in a condition of utter ruin or decline, words such as destitute, impoverished, and penniless can be used. In essence, there are many alternatives for the word rack-ruin that one can choose based on the situation.