勿
Explanation
“勿”是文言色彩较浓的否定副词，意为“不要”或“别”，常用于书面语或正式场合，表示禁止、劝阻或提醒不要做某事。
"Wu" is a negation adverb with a classical Chinese flavor, meaning "do not" or "don't". It is commonly used in written language or formal contexts to express prohibition, advice against an action, or a reminder not to do something.
Examples
希望各位勿忘十年后的约定。
I hope everyone does not forget the promise made ten years later.
我在国外一切都很好，勿念。
I am doing very well abroad, so please do not worry.
Related Grammar Points
未HSK 7七—九023
词类 · 否定副词
“未”是书面语中常用的否定副词，表示“还没有”“尚未”，强调动作或状态在某一时间之前没有发生或实现。
"未" is a formal negative adverb meaning "not yet" or "have not yet," used to emphasize that an action or state has not occurred or been realized up to a certain point in time.
Examples (2)
他至今还未和我联系。
He has not contacted me yet to this day.
虽然他四十未到，但已经是很成熟的经理了。
Although he is not yet forty, he is already a very mature manager.