The phrase "thou shalt not" is often associated with the Ten Commandments and is used to convey a strong sense of prohibition, forbidding an action or thought. There are several synonyms for this phrase, including "you must not," "it is forbidden," "you are prohibited," "do not do," "avoid," "refrain from," "stay away from," and "prohibit yourself." Each of these synonyms represents a phrase that can be used to express the same sentiment as "thou shalt not" and can be used interchangeably depending on the context and intended message. Choosing the right synonym can help convey the message with greater clarity and impact.