The packing work with high repeatability is quite onerous, heavy and boring leading to high turnover rates;

装箱工作重复性高，繁重枯燥，劳动强度大，产业工人流动率高。

youdao

The FSA has told the Co-Op that if it goes ahead with the deal, there will be regulatory consequences that the Co-Op's management regards as onerous - heavy enough, probably, to kill the deal.

BBC: The threat to Co-op��s plan to be a bigger bank