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

OTHER WORDS FROM arduous

Example sentences 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; harsh arduous conditions
hard to overcome or surmount; steep or difficult an arduous track

Derived forms of arduous

arduously, adverb arduousness, noun

Word Origin for arduous

C16: from Latin arduus steep, difficult