Dictionary

arduous

adjective ar·du·ous \ˈär-jə-wəs, -dy-, -jü-əs\

: very difficult

Full Definition of ARDUOUS

1
a :  hard to accomplish or achieve :  difficult <years of arduous training>
b :  marked by great labor or effort :  strenuous <a life of arduous toil — A. C. Cole>
2
:  hard to climb :  steep <an arduous path>
ar·du·ous·ly adverb
ar·du·ous·ness noun

Examples of ARDUOUS

  1. He went through a long and arduous training program.
  2. an arduous journey across miles of desert
  3. Traveling for several days by train, stagecoach and horseback, they would reach Mariposa Grove, a stand of some 200 ancient giant sequoias, where they would rest before embarking on an arduous descent via 26 switchbacks into the valley. —Tony Perrottet, Smithsonian, July 2008

Origin of ARDUOUS

Latin arduus high, steep, difficult; akin to Old Irish ard high
First Known Use: 1538

Synonym Discussion of ARDUOUS

hard, difficult, arduous mean demanding great exertion or effort. hard implies the opposite of all that is easy <farming is hard work>. difficult implies the presence of obstacles to be surmounted or puzzles to be resolved and suggests the need of skill or courage <the difficult ascent of the mountain>. arduous stresses the need of laborious and persevering exertion <the arduous task of rebuilding>.
ARDUOUSLY Defined for Kids

arduous

adjective ar·du·ous \ˈär-jə-wəs\

Definition of ARDUOUS for Kids

:  difficult 1 <an arduous climb>
ar·du·ous·ly adverb <working arduously>

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July 04, 2015
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