unsuccessful meaning in English
adj.
不成功的，失败的。
adv.
-ly ,-ness n.
Examples
- The search has been quite unsuccessful then ?
那么打捞是完全没办法了？ - An unsuccessful attack brings cries of "butcher" .
无成效的进攻易被讥为“屠夫”。 - David was an unsuccessful suicide .
大卫自杀未遂。 - His return showed that the struggle had been unsuccessful .
他回来这事表明那场斗争已经失败。 - 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。