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.

Origin of arduous

1530–40; < Latin arduus erect, steep, laborious; see -ous
Related forms
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for arduous

British Dictionary definitions for arduous

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for arduous

arduous


adj.

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