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Having or showing a capacity for persistent effort; not tiring or relenting: See Synonyms at tireless.

[Obsolete French indéfatigable, from Latin indēfatīgābilis : in-, not; see in-1 + dēfatīgāre, to tire out (dē-, intensive pref.; see de- + fatīgāre, to weary).]

in′de·fat′i·ga·bil′i·ty n.
in′de·fat′i·ga·bly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.indefatigability - tireless determination
determination, purpose - the quality of being determined to do or achieve something; firmness of purpose; "his determination showed in his every movement"; "he is a man of purpose"
References in classic literature ?
A new sensation is the breath in his nostrils; when his experience is exhausted he explores new fields with the indefatigability of a--"
But Liverpool rebuilt with the indefatigability that is so impressive under Klopp and from half-time on it was their game, the energy, the interplay, the ambition, that held sway.
The indefatigability of body and mind can only last so long.
One day, somewhere in the future, there would be a television montage to the tune of that hymn to indefatigability The Impossible Dream, and it was here that Henderson began to dream.
Galloway wasn't a politician when he spoke of the Iraqi people's indefatigability.
But the energy and desire of the last two performances - typified by Fabricio Coloccini's indefatigability at Old Trafford and the dash of Ayoze Perez - hinted at new beginnings on the field.
PJ's indefatigability likely stemmed from the fact that he'd never been handed anything in his life.
During a visit to Iraq in 1994, Galloway was filmed telling Saddam, "Sir, I salute your courage, your strength, your indefatigability.
It is an affirmation of Afghan aspirations and indefatigability.
In the end, rather than representing a form of "transcendental nonsense," as Felix Cohen famously put it, legal concepts in the common law exhibit a lure, simplicity, and indefatigability that can be explained only by their "transcendent common sense.