arduous

arduous (ˈɑːdjʊəs)

—*adj*
1.	requiring great physical or mental effort; difficult to accomplish; strenuous
2.	hard to endure; harsh: arduous conditions
3.	hard to overcome or surmount; steep or difficult: an arduous track

[C16: from Latin arduus steep, difficult]

'arduously

—*adv*

'arduousness

—n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline

Word Origin & History

arduous

1530s, "high, steep, difficult to climb," from L. arduus "high, steep," from PIE base *eredh- "to grow, high" (see ortho-). Metaphoric extension to "difficult" first attested 1713.

Example sentences

It's a seven-part series that takes you around the world to see the arduous

journeys taken by some species.

Without someone to turn to, without a proper sounding board, research is far

too arduous and far too lonely to sustain.

In the end, his arduous journey deeply illumines our own.

Their work is always arduous, often heroic and sometimes dangerous.

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laborious painful task tired toilsome troublesome

Matching Quote

"The profession of magician, is one of the most perilous and arduous specialisations of the imagination. On the one hand there is the hostility of God and the police to be guarded against; on the other it is as difficult as music, as deep as poetry, as ingenious as stage-craft, as nervous as the manufacture of high explosives, and as delicate as the trade in narcotics."

-William Bolitho