adj.不成功的；失敗的

My early attempts at learning to drive were unsuccessful. 我曾經(jīng)幾次打算學(xué)開(kāi)車，卻都沒(méi)有學(xué)成。

He was discouraged by the unsuccessful attempt. 這次不成功的嘗試使他氣餒。

After a series of unsuccessful attempts, he has finally passed the driving test. 經(jīng)過(guò)連續(xù)幾次的失敗，他最后終于通過(guò)了駕駛考試。

adv.失敗地；無(wú)用