unsuccessful
adj. 不成功的；失败的
例句
He made an unsuccessful run for governor in 2005.
2005年他竞选州长失败。
《牛津词典》
The climbers face certain death if the rescue today is unsuccessful.
救援行动如果今天不能成功，登山队员必死无疑。
His efforts were unsuccessful.
他的努力没有成功。
《柯林斯英汉双解大词典》
