thankness 有这个词吗

　　Being a middle manager is the most thankless job ever invented.

　　担任中层经理是人类有史以来发明的最吃力不讨好的工作。

　　Raise your hand for the thankless job nobody else wants to do.

　　即使是那种没人愿意干的吃力不讨好的活儿也要主动担当。

　　This is often a very thankless job, Legge says.

　　莱格博士说饭馆服务员是个费力不讨好的工作。