A more thorough explanation:

An adverse party is the opposing side in a legal case. This means that they have different interests and goals than the other party. For example, if someone is being sued, the adverse party would be the person or entity that is suing them.

In some cases, there may be multiple parties involved in a lawsuit, and they may agree on some issues but be adverse on others. For instance, in a divorce case, the parties may agree on how to divide their property but be adverse when it comes to child custody.

Another example of an adverse party could be in a contract dispute. If one party believes that the other party has breached the terms of the contract, they may take legal action against them. The adverse party in this case would be the party accused of breaching the contract.

Overall, an adverse party is simply the opposing side in a legal case, with different interests and goals than the other party.