arduous(adjective satellite) difficult to accomplish; demanding considerable mental effort and skill; "the arduous work of preparing a dictionary"
(adjective satellite) 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
(adjective satellite) taxing to the utmost; testing powers of endurance; "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"- F.D.Roosevelt
Source:
WordNet 2.0 Copyright 2003 by Princeton University. All rights reserved.
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