unsuccessful
US /ˌʌn.səkˈses.fəl/
UK /ˌʌn.səkˈses.fəl/

1.
不成功的, 失败的
not achieving the desired aim or result
:
•
Their attempts to reach an agreement were unsuccessful.
他们达成协议的尝试不成功。
•
The rescue mission was largely unsuccessful due to bad weather.
由于恶劣天气,救援任务大体上不成功。