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Definition of arduous


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ar·du·ous  audio  (ärj-s) KEY  

ADJECTIVE:
  1. Demanding great effort or labor; difficult: "the arduous work of preparing a Dictionary of the English Language" (Thomas Macaulay).
  2. Testing severely the powers of endurance; strenuous: a long, arduous, and exhausting war.
  3. 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)


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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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