mou4 haau6無效无效

Jyutpingmou4 haau6

Yalemòuh haauh

形容詞Uncommon

Definition

Invalid, ineffective, or of no effect; unable to produce the desired result.

neutraldaily actionsdescriptions

How it's used

While often used in formal contexts like legal contracts or official documents, it is also frequently applied to everyday situations where a strategy or tool fails to produce results. It carries a sense of finality, implying that the item or method in question has lost its power or legitimacy. When describing something that simply does not work, speakers often prefer the more casual 冇用.

Examples

ni1呢go3個fong1方faat3法si3試gwo3過hou2好do1多ci3次dou1都hai6係mou4無haau6效。

This method has been tried many times and is ineffective.

nei5你ne1呢zoeng1張fei1飛gwo3過zo2咗kei4期，ji5已ging1經mou4無haau6效㗎gaa2喇。

Your ticket is expired and is already invalid.

Common phrases

hap6合joek3約mou4無haau6效

contract is invalid

jyun4完cyun4全mou4無haau6效

completely ineffective

Common mistake

Learners sometimes use 無效 to describe a person who is lazy or incompetent, but it should be reserved for things, methods, or documents that lack legal or functional power. Use 冇用 or 廢嚟形容人會更加自然。