无 效

wúxiào

“Not valid” in Chinese is 无效 (wúxiào).

Meaning

not valid
ineffective
in vain

Example

我的信用卡无效。

My credit card was invalid.

Example sentence from Tatoeba (CC BY 2.0).

Characters

wúHSK 44 strokesnot to have xiàoHSK 310 strokesto imitate (variant of 效[xiao4])

More HSK 6 words

指数zhǐshù(numerical, statistical) indexHSK 6 好转hǎozhuǎnto improveHSK 6 清明节Qīngmíng JiéQingming or Pure Brightness Festival or Tomb Sweeping Day, celebration for the dead (in early April)HSK 6 作战zuòzhàncombatHSK 6 接收jiēshōureception (of transmitted signal)HSK 6 柱子zhùzipillarHSK 6 升级shēngjíto go up by one grade; to be promotedHSK 6 清洁工qīngjiégōngcleanerHSK 6 进攻jìngōngto attackHSK 6 多方面duō fāngmiànmany-sidedHSK 6