无效

wúxiào

adjective★Intermediate— invalid

⚖️Law

formal

Not legally binding or enforceable; invalid.

法院裁定该协议无效。

The court ruled the agreement invalid.

💡

Common in legal contexts to describe contracts, laws, or documents that lack legal force.

general

Not producing the intended result; ineffective.

这个药对他的病无效。

This medicine is ineffective against his illness.

💡

Used in medical or technical contexts to describe a lack of effect.

Collocations

无效合同invalid contract无效证明invalid proof无效处理invalid processing

invalid action

invalid ballot

In legal documents, '无效' often requires formal declaration by a court or authority.

Use '无效' in formal contexts like contracts or legal proceedings.

From '无' (not) + '效' (effect), literally meaning 'no effect'.

Commonly used in legal, medical, and technical contexts to describe something that lacks validity or effectiveness.

无

not

prefix

效

effect

root

汉英词典