Synonym: tireless, unflagging, unwearying. Similar words: gabled, fatigue, litigation, mitigation, defalcation, investigation, bill of attainder, in defiance of. Meaning: [‚ɪndɪ'fætɪgəbl] 
adj. showing sustained enthusiastic action with unflagging vitality.
adj. showing sustained enthusiastic action with unflagging vitality. 
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1. His indefatigable spirit helped him to cope with his illness.
2. Annie was an indefatigable campaigner for better community services.
3. She was indefatigable in her search for the truth.
4. Neil - the indefatigable road hog, tireless adventurer, tired.
5. Meanwhile, the body is fluid, strong and apparently indefatigable.
6. But the indefatigable Swans, yellow labels flapping from their shoulder bags, would never dream of sitting anything out.
7. That kind of instinctive, indefatigable willingness to engage is a gift, Mr Caen, as unteachable as it is unbuyable.
8. In New York, the indefatigable Olmsted refused to give up the battle.
9. Virginia was an indefatigable walker, both in Sussex and London.
10. Indefatigable, playing the hard way[sentencedict.com], with his own set of rules to back him up.
11. Not surprisingly, the indefatigable Paul-Henri Spaak was in the forefront of these arguments for new departures.
12. She won because of her indefatigable energy and willpower, mobilizing women in state after state where the Amendment was contested.
13. The indefatigable Baedeker produced his first guidebook to this country in 1877.
14. A modest and sincere man, his indefatigable hard work and innate sense of justice made him popular with his workforce.
15. The letters show Pelham to have been indefatigable and devoted to the parliamentary cause.
16. Camel - Docility, patience and indefatigable perseverance.
17. The indefatigable bell now sounded for the fourth time.
18. an indefatigable defender of human rights.
19. The indefatigable Walters was in his element.
20. He was indefatigable in his efforts to secure funding for new projects.
21. Mr Gooch, an indefatigable and poker-faced researcher, tracks down the one man known to have kissed her: "I had the feeling of kissing a skeleton and in that sense it was a shocking experience."
22. Through indefatigable effort, france had gained delectable success in informatization respect.
23. The very reputation of being strong-willed, plucky(sentencedict.com), and indefatigable is of priceless value. - Charles Robert Darwin.
24. The water edge brimmed with children the waves with surf riders the deep with indefatigable crawl swimmers flashing spray over wet heads.
25. Better-known candidates fell by the wayside, but Alexander kept going, like the indefatigable bunny in battery advertisements.
26. But Chou Enlai was much more than a brilliant, almost indefatigable ( tireless ), administrator.
27. Encouraged by this discovery, Edmond determined to assist the indefatigable laborer.
28. The President propped up high in his chair, carved beef for all with masterly, indefatigable skill.
29. It indicated the restless vivacity of her spirit, which to-day was doubly indefatigable in its tiptoe dance, because it was played upon and vibrated with her mother's disquietude.
30. The very reputation of being strong - willed, plucky , and indefatigable is of priceless value.
More similar words: gabled, fatigue, litigation, mitigation, defalcation, investigation, bill of attainder, in defiance of, definable, declaration of independence, indelible, turn a blind eye, undesirable, indestructible, indispensable, insatiable, forefather, deface, defame, independent, femme fatale, independence, mitigate, default, de facto, defaced, be independent of, castigate, instigate, investigate.