adj.徒然的，徒劳的，无效的

Efforts to convince her were futile.
试图说服她所作的努力是徒劳的。
It would be futile to argue with her.
去跟她争辩是徒劳的。
Eric is a futile sort of person.
埃里克是一个无用的人。
The search for a cure was futile, as the disease proved incurable.
寻找治愈方法是徒劳的，因为这种疾病无法根治。
His efforts to persuade her were futile; she remained stubbornly unyielding.
他试图说服她的努力是无效的，她固执地不肯让步。
Trying to change her mind after she made up her decision was a futile attempt.
在她做出决定后试图改变她的想法是无用的尝试。
He spent hours working on the problem, but his efforts were ultimately futile.
他在问题上花了几个小时，但最终还是徒劳无功。
Her prayers for rain were futile during the drought-stricken season.
旱季里，她祈求下雨的努力毫无效果。
Frustration grew as they realized their efforts to fix the computer were futile.
他们意识到修理电脑的努力白费力气，沮丧感油然而生。
His attempts at reconciliation were futile against her anger and resentment.
他在和解方面的尝试在她满腔怒火和怨恨面前显得无济于事。
She knew her减肥计划是徒劳的，因为她没有坚持健康饮食和运动。 (她明白减肥计划是无效的，因为她没有坚持健康饮食和锻炼。
His efforts to escape the burning building proved futile as he was trapped by the flames.
他试图逃离着火的大楼的努力最终是徒劳的，因为火焰把他困住了。
The government's promise to address the issue was met with skepticism, as their previous actions had been futile.
政府承诺解决这个问题时，人们持怀疑态度，因为他们先前的行动已证明无效。