unsuccessful

adj.

不成功的，失败的；碌碌无为；

1. 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。
2. He was discouraged by the unsuccessful attempt.
   这次不成功的尝试使他气馁。
3. The unsuccessful candidate demanded a re-count.
   那个落选的候选人要求重新计算选票。
4. 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。

Unsuccessful Predation and Evolution
Strategies of Unsuccessful Language Learners
Predicting the outcome of unsuccessful prehospital advanced cardiac life support
Unsuccessful Emergency Medical Resuscitation — Are Continued Efforts in the Emergency Department Justified?
Predictors for unsuccessful pessary fitting in women with symptomatic pelvic organ prolapse: a prospective study.
Differential activation of the prefrontal cortex in successful and unsuccessful memory retrieval
The long-term outcome of pituitary irradiation after unsuccessful transsphenoidal surgery in Cushing's disease.
Comprehension of arithmetic word problems: A comparison of successful and unsuccessful problem solvers.
Is Delayed Surgery After Unsuccessful Conservative Treatment Beneficial for Spinal Cord Injury Following Whiplash? A Retrospective S...
Efficacy and safety of thrombolytic therapy after initially unsuccessful cardiopulmonary resuscitation: a prospective clinical trial