The term "clean code" refers to a coding style that emphasizes readability, simplicity, and maintainability. However, there can be many antonyms for "clean code," depending on how we interpret the opposite of these qualities.
One possible antonym for "clean code" could be "complex code," which often includes convoluted logic, excessive nesting, and hard-to-follow control flow. Another opposite of "clean code" could be "unreadable code," characterized by poor naming conventions, missing documentation, and lack of comments.
Another antonym for "clean code" could be "inefficient code," which often results from poor algorithm design, excessive memory usage, or unnecessary computations. Ultimately, the opposite of "clean code" could represent any combination of non-compliant coding practices that violate the principles of good software engineering.