arduous
[ ahr-joo-uhs or, esp. British, ahr-dyoo- ]
/ ˈɑr dʒu əs or, esp. British, ˈɑr dyu- /
adjective
requiring great exertion; laborious; difficult: an arduous undertaking.
requiring or using much energy and vigor; strenuous: making an arduous effort.
hard to climb; steep: an arduous path up the hill.
hard to endure; full of hardships; severe: an arduous winter.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for arduousness
British Dictionary definitions for arduousness
arduous
/ (ˈɑːdjʊəs) /
adjective
requiring great physical or mental effort; difficult to accomplish; strenuous
hard to endure; harsharduous conditions
hard to overcome or surmount; steep or difficultan arduous track
Derived Formsarduously, adverbarduousness, noun
Word Origin for arduous
C16: from Latin arduus steep, difficult
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for arduousness
arduous
1530s, "hard to accomplish, difficult to do," from Latin arduus "high, steep," also figuratively, "difficult," from PIE root *eredh- "to grow, high" (see ortho-). Literal sense of "high, steep, difficult to climb," attested in English from 1709.
Online Etymology Dictionary, © 2010 Douglas Harper