无效 (wú xiào) — invalid, ineffective, in vain
Definition
无效 describes something that has no legal force or produces no result — used for contracts, certificates, and medicines. Closest to 失效 (which focuses on something ceasing to be valid over time); 白白 stresses effort wasted, not a document's status.
verb
invalidineffectivein vain
Examples
- 无效。Zhè fèn hé tong yǐ jīng wú xiào le.This contract is already invalid.
- ，无效。Tā shì le hǎo jǐ cì, dàn dōu shì wú xiào de.He tried several times, but all were in vain.
- 无效。Zhè zhǒng yào duì tā wán quán wú xiào.This medicine is completely ineffective for him.
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