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Definition of arduously : In an arduous manner; with difficulty or laboriousness.

Synonyms:

hard, easy, heavily

grievously, agonizingly, distressingly, gruelingly, excruciatingly, tryingly, tormentingly, aggravatingly, unpleasantly, troublesomely, gnawingly, witheringly, unbearably, sorely, irritatingly, annoyingly, painfully, uncomfortably, woefully, achingly, bitterly, miserably, horrendously, smartingly, piercingly, hurtfully, irksomely, bitingly, offensively, disagreeably, cruelly, odiously, torturously, stingingly, oppressively, acutely, insufferably, severely, distressfully

fussily, stressfully, roughly, harshly, adversely, ruggedly, laboriously, grindingly, demandingly, contrarily, toughly, tightly, strenuously, wearisomely, complexly, difficultly, knottily, formidably, ticklishly, trickily, toilsomely, complicatedly, cantankerously, onerously

Usage examples:

• Ever since I have resumed my work in the Holy Land I have been awaiting with eager and particular interest the detailed letters, individual as well as collective, of my loved ones in Germany, who, I am sure are arduously, devotedly and efficiently carrying on the Great Work which the Master has destined for them in this world. - "The Light of Divine Guidance (Volume 1)", Shoghi Effendi.
• The people worked arduously and without intermission; the land was rich, the seasons propitious; yet they almost constantly suffered the pangs of hunger, which spread sometimes to wholesale starvation. - "Irish Race in the Past and the Present", Aug. J. Thebaud.
• In the course of his long and wandering life how often had he been paid off; how often had he felt his pockets heavy with the gold so arduously toiled for; how often had he vowed to himself that this time he would keep it! - "Wild Justice: Stories of the South Seas", Lloyd Osbourne.