- 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
Synonyms for arduousSee more synonyms for on Thesaurus.com
Antonyms for arduous
Examples from the Web for arduously
Historical Examples of arduously
She studied music, arduously playing accompaniments for her mother.Melomaniacs
It was as if every morning that ship had been arduously explored with—with toothbrushes.Falk
"You have been working most arduously, Senor Carson," said Quesada.The Wolf Cub
Gifted with a naturally fine organ, he has cultivated it arduously and to excellent purpose.Vocal Mastery
Arduously, but without avail, she searched through all the drawers and cupboards of the Rattle-Pane kitchen.Peace on Earth, Good-will to Dogs
Eleanor Hallowell Abbott
- 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
Word Origin for arduous
Word Origin and History for arduously
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.