If you describe a task or job as laborious, you mean that it takes a lot of time and effort. Keeping the garden tidy all year round can be a laborious task. + laboriously la·bo·ri·ous·ly the embroidery she'd worked on so laboriously during the long winter nights. taking a lot of time and effort laborious process/task/business etc
characterized by toilsome effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"