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arduous (adj.)

1530s, "hard to accomplish, difficult to do, attended with much labor," from Latin arduus "high, steep," also figuratively, "difficult, hard to reach," from PIE root *eredh- "high" (see ortho-). Literal sense of "high, steep, difficult to climb" is attested in English from 1709. Related: Arduously; arduousness.

What is arduous requires more energy and endurance, and is less within the reach of common powers, than what is hard. Its primitive meaning of steep climbing is still felt in it, and makes it suggestive of severe and protracted effort. [Century Dictionary]

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Definitions of arduous from WordNet

arduous (adj.)
characterized by effort to the point of exhaustion; especially physical effort;
worked their arduous way up the mining valley
Synonyms: backbreaking / grueling / gruelling / hard / heavy / laborious / operose / punishing / toilsome
arduous (adj.)
taxing to the utmost; testing powers of endurance; "your willingness after these six arduous days to remain here"- F.D.Roosevelt;
Synonyms: straining / strenuous
arduous (adj.)
difficult to accomplish; demanding considerable mental effort and skill;
the arduous work of preparing a dictionary
From wordnet.princeton.edu

Dictionary entries near arduous

-ard

ardency

ardent

ardor

ardour

arduous

ardurous

are

area

areal

area-way