If something is ineffective, it does not do the job it is meant to do. A medicine can be ineffective if you still feel ill.

If something is ineffective如果一個東西是ineffective（沒效果）的, it does not do the job it is meant to do它就沒有做到它應該做的工作。A medicine can be ineffective一種藥可能是ineffective的 if you still feel ill如果你吃了還是覺得不舒服。

A rule, a plan, a warning, or a teaching method can be ineffective if nothing really changes. You can also call a person ineffective in a role — a leader, a teacher, a team — when their work does not bring the result people wanted.

A rule, a plan, a warning, or a teaching method can be ineffective一條規定、一個計畫、一個警告，或一種教學方法都可能是ineffective的 if nothing really changes如果什麼都沒有真正改變。You can also call a person ineffective in a role你也可以說一個人在某個角色上是ineffective的 — a leader, a teacher, a team像領導者、老師、團隊 — when their work does not bring the result people wanted當他們的表現沒有帶來大家想要的結果。

It is a clear, slightly formal critic's word, common in news, school, and offices.

It is a clear, slightly formal critic's word這是個意思清楚、帶點正式感的批評用字, common in news, school, and offices在新聞、學校和辦公室裡很常見。

It is not the same as inefficient: inefficient means it works, but slowly or with waste; ineffective means it basically fails. And it is a little cooler than ineffectual, which often paints a person as weak or lacking force, not just a method that missed.

It is not the same as inefficient它跟inefficient不一樣: inefficient means it works, but slowly or with wasteinefficient的意思是有效，但很慢或浪費資源; ineffective means it basically failsineffective的意思是基本上沒有成功。And it is a little cooler than ineffectual而且它比ineffectual的語氣稍微冷一點, which often paints a person as weak or lacking forceineffectual常常把一個人描繪成軟弱、沒有力量, not just a method that missed而不只是一個沒成功的方法。