Having children myself, I feel humbled by the indefatigability of our parents.
From the guardian.co.uk
This is the optimism and indefatigability upon which AFC Wimbledon has been founded.
From the telegraph.co.uk
He strikes an elevated pose of dignity, triumph, near indefatigability.
From the independent.co.uk
As she considers her answer, indefatigability wrestles with pessimism in her expression.
From the guardian.co.uk
Most readers will admire the author's indefatigability, but secretly wish he had done more sifting.
From the economist.com
As an effort to perk up the nation, Mr Cameron's speech went as far as bromides about British indefatigability can.
From the economist.com
The link between Thatcher's indefatigability and not much kip popularised the 80s'notion that sleep was for wimps.
From the independent.co.uk
Named after Gary Player, the Londoner has shown reserves of indefatigability that live up to the example set by the South African.
From the dailymail.co.uk
Philliskirk rightly praised his side's indefatigability, even when 3-0 down before a raucous 4,000-strong visiting contingent.
From the independent.co.uk
More examples
Tireless determination
(indefatigable) showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"
Fatigue (also called exhaustion, lethargy, languidness, languor, lassitude, and listlessness) is a state of awareness describing a range of afflictions, usually associated with physical and/or mental weakness, though varying from a general state of to a specific work-induced burning sensation ...
(Indefatigable) Eight ships of the Royal Navy have been named HMS Indefatigable: * was a 64-gun third rate ship of the line launched in 1784, razeed to a 38-gun frigate in 1795 and broken up in 1816. * was an armed ship purchased in 1804 and sold in 1805. ...