台Taivo A Taiwan Mandarin dictionary

無效

wúxiào

ㄨˊ ㄒㄧㄠˋ

Simplified 无效

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  1. 1not valid
  2. 2ineffective
  3. 3in vain
Example

我的信用卡無效。

wǒ de xìnyòngkǎ wúxiào

My credit card was invalid.

Keep 無效 and it comes back until you know it.

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