la ‧ bo ‧ ri ‧ ous /ləˈbɔːriəs/ BrE AmE adjective
taking a lot of time and effort
laborious process/task/business etc
Collecting the raw materials proved a long and laborious task.
the laborious business of drying the crops
—laboriously adverb :
A beetle began to crawl laboriously up his leg.