unsuccessful

Despite his best efforts, his campaign was unsuccessful.

儘管他盡了最大努力，他的競選活動還是失敗了。

After hours of searching, the rescue team found their efforts to locate the missing person unsuccessful.

經過數小時的搜尋，救援隊發現他們尋找失蹤者的努力徒勞無功。

She attempted to fix the old radio, but was ultimately unsuccessful.

她試圖修理舊收音機，但最終還是失敗了。