Word for needless repetitive work

I need to describe to a colleague in writing that a certain task, while possible, requires a lot of manual repetitive work.

I was hoping for a word to describe it but couldn't find anything that fits.

In Israel we commonly use the word סיזיפי which is borrowed from Greek Mythology (the story of Sisyphus). It is well-known and well-used to describe a task that is repetitive and tiring.

Does the English language have a word that I can use with the same meaning?

Example sentence: "This is a ____ task which requires a lot of time and repetitive work. We should consider automating it."

The word sisyphean is used in English as well. The word is defined by Oxford Dictionaries as

Denoting a task that can never be completed.

But I feel the word mindless might capture your intention better:

1.1 (of an activity) so simple or repetitive as to be performed automatically.
// ‘the monotony of housework turns it into a mindless task’

(source: Oxford Dictionaries)

This drudgery requires a lot of time and repetitive work. We should consider automating it.

Mind-numbing, perhaps?

Relentless, tedious, tiresome, dull work is often automated.