thankless

Cleaning the public beach was a thankless job, but volunteers did it anyway.

清扫公共海滩是一件吃力不讨好的工作，但志愿者们还是做了。

用法提示：thankless 作定语修饰 job，表示“得不到回报的；吃力不讨好的”。

She received a thankless task: reorganizing the old files with no recognition.

她接到了一项无人感激的任务：整理旧文件，却得不到任何认可。

用法提示：thankless 作定语修饰 task，表示“无人感谢的；徒劳无功的”。

Being a referee is often a thankless role, yet someone has to do it.

当裁判往往是一个吃力不讨好的角色，但总得有人去做。

用法提示：thankless 作定语修饰 role，表示“得不到感激的；吃力不讨好的”。