"Pretty kettle of fish" is an idiom that refers to a chaotic or difficult situation. There are numerous synonyms for this phrase, including "messy situation," "complicated problem," "difficult puzzle," "complex conundrum," "troublesome matter," "knotty predicament," and "confusing labyrinth." All of these phrases suggest a sense of confusion, disorder, and difficulty. When faced with a pretty kettle of fish, it's important to tackle the problem systematically and calmly, taking one step at a time until a solution is found. By using one of these synonyms in your conversations or writing, you can accurately describe a difficult situation without resorting to cliches.