arduously

In painstaking fashion

Arduously means with great effort, difficulty, or strain.

Tasks performed arduously require sustained exertion and often test one's endurance or patience.

She arduously climbed the steep mountain trail, stopping frequently to catch her breath.

The word suggests not just difficulty but the wearing nature of prolonged struggle—work that is arduously completed has demanded considerable labor over time.

persistent

tenaciously

With stubborn persistence

steadfastly · resolutely · unrelentingly · tirelessly · indefatigably · patiently · enduringly · persistently · relentlessly · unceasingly

laborious

toilsome

Requiring strenuous effort

backbreaking · plodding · tedious · wearisome · burdensome · onerous · tiring · fatiguing · effortful · slog

strenuous

exertion

Vigorous physical effort

taxing · intense · draining · punishing · sapping · uphill · sweat · toil · struggle · laboring

difficult

painstakingly

With extreme thoroughness

formidably · intricately · complicatedly · problematically

Opposites
effort and difficulty

arduouslyeffortlessly

Without visible labor

easily · painlessly · smoothly · lightly · simply

energy and vigor

arduouslylazily

Without exertion or haste

languidly · listlessly · sluggishly · indolently · lackadaisically

Family

arduous, arduousness

Familiarity
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Used worldwide · Timeless · Abstract · Negative · Everyday, not technical · Rated G