她试了几次，但这个不成功的计划还是没能解决问题。

She tried several times, but the ___unsuccessful plan still didn't solve the problem.

尽管付出了很多努力，他在这部电影中的表演还是未能获得任何奖项提名。

Despite his hard work, his performance in the movie was ___unsuccessful in getting any award nominations.

他的新广告方案没有被客户接受。

His new advertising plan was ___unsuccessful in winning over the clients.