adj.不成功的；失败的
My early attempts at learning to drive were unsuccessful. 我曾经几次打算学开车，却都没有学成。
He was discouraged by the unsuccessful attempt. 这次不成功的尝试使他气馁。
After a series of unsuccessful attempts, he has finally passed the driving test. 经过连续几次的失败，他最后终于通过了驾驶考试。
adv.失败地；无用
