Definition of laborious
1a : involving, requiring, or characterized by hard and sustained effort : arduous Overland travel was not an adventurous communal leap, but a laborious, individual trek.— Daniel J. Boorstin Making a telescope mirror is a long and laborious process.— David Devoss and Eric Sander
b : characterized by long, detailed elaboration : tedious Much of the middle of the book is a laborious account of the scouring of the ocean floor that led to the discovery of the Titanic. — The Economist
2 : devoted to labor : industrious We have the greatest riches, the greatest fertility, … the most laborious population.— Joseph Conrad
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