INDEFATIGABLY Synonyms: 13 Similar and Opposite Words

indefatigably

adverb

as in tirelessly

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Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of indefatigably Selling cigarettes on the street to buy food for her siblings, the pre-teen is indefatigably upbeat, eagerly anticipating an imminent passage to Germany. — Guy Lodge, Variety, 24 Jan. 2026 Matthew Restall, for example, has worked indefatigably as a myth buster for dozens of misconceptions for roughly two decades now, and only recently did another historian, Camilla Townsend, stitch together the history of the Aztecs according to their own statements, as recorded in Nahuatl. — Literary Hub, 18 Aug. 2025

Recent Examples of Synonyms for indefatigably

Adverb

Your support means a great deal to us, and especially to our theatre team members at AMC Kips Bay 15 who work tirelessly day-in and day-out to put smiles on your faces.

— Jordan Moreau, Variety, 24 Oct. 2026
Before the younger Greaves took on the project, William’s wife, Louise Archambault, worked tirelessly to bring it to life after William died in 2014.

— Ryan Lattanzio, IndieWire, 22 Oct. 2026

Definition of tirelessly

Adverb

The president has continued to vigorously back Paxton throughout the general election, making several trips to Texas to campaign for him.

— Caroline Linton, CBS News, 21 Oct. 2026
His critics interpreted it as endorsing the massacre of Israeli civilians, though Abu Shehadeh and others vigorously denied that claim.

— Tamir Sorek, The Conversation, 20 Oct. 2026

Definition of vigorously

Adverb

Italians are fed energetically with the sustenance of beauty, ease, and joy.

— Sandra Salibian, Footwear News, 23 Oct. 2026
Molecules pooling close to regions that repel water can be forced into distinctive arrangements that are energetically costly to maintain, resembling pieces of a jigsaw puzzle pushed into patterns poised on the verge of scattering.

— Mike McRae October 13, New Atlas, 14 Oct. 2026

Definition of energetically

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indefatigable

indefatigably

indefeasible

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“Indefatigably.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/indefatigably. Accessed 27 Oct. 2026.

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Synonyms of indefatigably

adverb

Example Sentences

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