Word: 无效 (wúxiào) Traditional: 無效 无效 dictionary entry wúxiào not valid; ineffective; in vain Full dictionary entry for 无效 Example sentences using 无效 3 sentences, showing page 1 of 1. 没有签名的合同是无效的。 Méiyǒu qiānmíng de hétong shì wúxiào de. A contract without a signature is not valid. 法官裁定这份合同无效。 Fǎguān cáidìng zhè fèn hétong wúxiào. The judge ruled that this contract is invalid. 裁判判定这个球无效。 Cáipàn pàndìng zhège qiú wúxiào. The referee ruled that the goal didn't count.