unsuccessful(形容词):不成功的;未达到预期的;失败的。常用来描述尝试、计划、努力或结果没有获得成功。(也可用于指人“未能成功”,但更常修饰事件/行动。)
/ˌʌn.səkˈses.fəl/
The first attempt was unsuccessful.
第一次尝试没有成功。
Despite months of preparation, the negotiation proved unsuccessful due to a lack of trust between the two sides.
尽管准备了数月,由于双方缺乏信任,这次谈判最终仍未成功。
由前缀 un-(表示否定,“不”)+ successful(成功的)构成;successful 来自 success(成功),而 success 源于拉丁语 successus,有“结果、进展、成就”之意。因此 unsuccessful 字面意思就是“没有成功的”。