thankless
adjective uk/ˈθæŋk.ləs/ us/ˈθæŋk.ləs/
出力不讨好的;徒劳无功的
A thankless job is difficult or unpleasant, and people do not thank you for it.
Keeping the boys' rooms tidy is a thankless task/job. 保持男孩们的房间整洁是件吃力不讨好的事。
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