I've come up with two words, but not sure if they are the most common collocations in this case.

laborious method

arduous method

Both of them sound rather formal to me. So, I would like to ask, how to make them sound more colloquial without changing the meaning here?

  • The two adjectives are not formal; they are specific to situations in which a great deal of effort, often physical effort, is required. Words such as difficult / tough are far more general and don't fit many contexts to which your two adjectives apply. – Ronald Sole Dec 12 '20 at 19:00

You can say a demanding or challenging method, which is less formal than arduous and laborious.

A more neutral adjective would be difficult.

If you want to be even more colloquial you could say a tough method.

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