Definition of arduous

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< ardour

are >

ar·du·ous

(är

s) KEY

ADJECTIVE:

Demanding great effort or labor; difficult: "the arduous work of preparing a Dictionary of the English Language" (Thomas Macaulay).
Testing severely the powers of endurance; strenuous: a long, arduous, and exhausting war.
Hard to traverse, climb, or surmount. See Synonyms at burdensome, hard.

ETYMOLOGY:
From Latin arduus, high, steep

OTHER FORMS:
ardu·ous·ly (Adverb), ardu·ous·ness (Noun)

Thesaurus: synonyms for arduous

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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
Published by the Houghton Mifflin Company. All rights reserved.
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