'无须' is an adverbial phrase meaning 'no need to' or 'there is no need to'. It combines the characters 无 (wú), meaning 'not' or 'without', and 须 (xū), meaning 'must' or 'necessary'. Together, they literally convey 'without necessity', functioning as a concise, formal alternative to longer expressions like 不必 (bù bì) or 没有必要 (méi yǒu bìyào). It typically precedes a verb and implies that an action is unnecessary, often due to circumstances being already sufficient, obvious, or irrelevant.

This phrase is common in written Chinese and formal spoken contexts—such as instructions, official notices, or polite suggestions—but is rarely used in casual conversation. It carries a neutral-to-polite tone and often appears in contexts involving efficiency, clarity, or courtesy: for instance, when reassuring someone that a step can be skipped or a form doesn’t require completion. Learners should note that it cannot stand alone; it must directly modify a verb or verb phrase, and it does not take aspect particles like 了 or 过.