indefatigably

With endless stamina

Indefatigably means without tiring or giving up, with persistent energy that doesn't flag: She worked indefatigably to finish the project.

The word suggests admirable stamina in pursuit of a goal, though it can shade toward obsessive when the effort seems disproportionate to the cause.

persistence

relentlessly

Without stopping or weakening

unwaveringly · steadfastly · unflaggingly · resolutely · unrelentingly · determinedly · perseveringly · obstinately · stubbornly · single-mindedly

stamina

enduringly

In persistent manner

hardily · durably · strongly · resiliently · toughly · staunchly · stalwartly · mightily · powerfully · stamina

diligence

assiduously

With persistent careful effort

painstakingly · scrupulously · sedulously · earnestly · studiously · thoroughly · carefully · attentively · methodically · rigorously

energy

energetically

With much vigor

vivaciously · exuberantly · enthusiastically · animatedly · zestfully · ebulliently · fervently · ardently · passionately · wholeheartedly

Opposites
energy and tirelessness

indefatigablywearily

In exhausted manner

tiredly · languidly · feebly · listlessly · weakly

effort and industriousness

indefatigablyidly

Without aim or effort

lazily · indolently · slothfully · halfheartedly · apathetically

Family

indefatigable, indefatigability

Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Abstract · Positive · Everyday, not technical · Rated G