The crossword solution for the term 'Naughty Act' is 'SIN'. A SIN is an immoral act that is considered to be a violation of religious or moral law. It is often seen as a transgression against divine law and is considered to be an offense against God or the gods. Sins are generally seen as acts of disobedience, and can range from minor offenses such as lying or stealing, to more serious offenses such as murder or adultery.