No. 6,559 in Chinese
无效
Invalid; ineffective.
In a sentence
该药物对他的病情无效。
This medication is ineffective for his condition.
无效 is used to express that something fails to produce the desired effect or result.
这个优惠券已经无效了。
This coupon is no longer valid.
无效 indicates the state of being invalid or void.
他尝试输入密码，但系统提示无效。
He attempted to enter the password, but the system indicated an invalid input.
无效 is used to denote an unsuccessful operation or action.
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