adj.徒劳的，无成果的

Despite numerous attempts, the search for a cure remained unavailing.
尽管多次尝试，寻找治愈方法还是徒劳无功。
His efforts to negotiate a peaceful settlement were unavailing.
他试图和平解决争端的努力未能成功。
The medicine proved unavailing against his severe headache.
这种药对他的严重头痛毫无效果。
Unavailing in her attempts to persuade him, she reluctantly agreed.
她试图说服他未果，只好勉强同意。
His financial aid application was unavailing due to incomplete documentation.
由于文件不全，他的经济援助申请未能获得批准。
The old man's health had deteriorated to the point where medical intervention was unavailing.
老人的身体状况恶化到无法通过医疗手段救治的地步。
Her persistence in learning a new language was unavailing, as she never mastered it fully.
她坚持学习新语言的努力没有成效，始终未能完全掌握。
The rescue team's efforts were unavailing, as the victim succumbed to their injuries.
救援队的努力未能成功，受害者最终因伤势过重而去世。
No amount of pleading could convince the judge, as he remained unavailing to their arguments.
无论怎么恳求，法官都不为所动，他们的论点对他来说无效。
After months of training, her performance in the competition was unavailing, not living up to her expectations.
经过几个月的训练，她在比赛中的表现令人失望，未能达到预期。