The common phrase "fine kettle of fish" means a difficult or complicated situation. However, there are several other synonyms that can convey the same meaning. The phrase "can of worms" is often used when a situation becomes complicated and confusing. "Quagmire" is also appropriate to describe a difficult situation that seems almost impossible to solve. A "sticky wicket" refers to a tricky situation that is difficult to navigate, while the phrase "hot potato" means a difficult or sensitive issue that is best avoided. Lastly, "snake pit" describes a chaotic and troublesome situation that can be difficult to handle. Overall, these synonyms offer a range of colorful and descriptive alternatives to "fine kettle of fish".