What does it mean for red wine that was not refrigerated to go bad?

It is not accurate to say that red wine that was not refrigerated will necessarily go bad. Red wine is typically best stored at cellar temperatures (around 55-65 degrees Fahrenheit) and can be safely kept in a cool, dark place for extended periods. When red wine is exposed to higher temperatures, it may undergo premature aging and lose some of its flavor and complexity. However, it is unlikely to spoil or become unsafe to drink.