未能成功的英文怎么说

"Unsuccessful" 是表示未能成功的常用形容词。这个形容词来源于英语动词 "succeed," 它的意思是 "成功，达到目的"。

下面是一些带有 "unsuccessful" 的英文例句及其中文翻译：

The company's latest product launch was unsuccessful. (公司最新的产品发布没有成功。)
She tried to quit smoking several times, but each attempt was unsuccessful. (她试图几次戒烟，但每次尝试都没有成功。)
Despite his best efforts, the actor's audition was unsuccessful. (尽管他尽了最大努力，演员的试镜还是没有成功。)