One last onerous task to complete, and then she could leave.

I shall think up some onerous task by and by.

Having to play along with their rules and head games was an onerous task.

Then there was the onerous task of making his report to the Admiralty.

These are not onerous tasks; none takes more than a few minutes out of their day.

They would let him, he knew; it was an onerous task.

Machines cannot detect it or they would have been used for this onerous task.

When it came down to asking for cash and support, he would perform that onerous task.

She went early to Alfred's room the next morning, prepared to undertake the onerous task.

The only solution is to pull them out, root and all, an onerous task by any definition.