Then he nodded courteously to me and walked off to perform his unpleasant duty.

他彬彬有礼地向我点点头，然后就走开去执行他令人讨厌的任务。

《柯林斯英汉双解大词典》

It was not an affliction, but it was an unpleasant duty.

那不是一种苦恼，不是，而是一桩苦差事。

youdao

Maurice the Censor has been given the unpleasant duty of assessing just what can and cannot be allowed to be read by the general public.

毛瑞思审阅员有一个不是很令人愉快的工作，即评定出那些不适合被公众阅读的读物。

youdao

Eventually, engineers will work entirely in the abstract world of forms emerging only for the unpleasant, if necessary, duty of turning them into things tangible enough for people to buy.

ECONOMIST: Manufacturing technology

Our duty in this case is as unpleasant as it was unsought.

CNN: Sen. Gorton's closed-door impeachment statement

When anything unpleasant happens within the family thereafter, the blame is heaped on the hapless dead relation - for sleeping on duty.

BBC: Letter from Africa: Rites of the dead