"Tut Tut" is an exclamatory phrase that conveys a mild expression of disapproval or disappointment. There are a number of synonyms that can be used instead of this phrase such as "tsk tsk," "shame on you," "shush," "tsk," "tut," "tsk tsk tsk," and "cluck." All of these expressions communicate an element of disapproval or censure, but the degree of severity varies. They are commonly used when someone has done something that is considered inappropriate or unacceptable. Whether in verbal or written communication, it's essential to choose the right synonym so that our message is conveyed accurately and inconspicuously.