Similar words: tiring, retiring, airing, firing, hiring, stirring, admiring, aspiring. Meaning: adj. characterized by hard work and perseverance.
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1. She is untiring in her efforts to help the homeless.
2. Gonzales has been an untiring fighter for democracy.
3. His general attitude is one of an untiring and immense courtesy and helpfulness.
4. Cardinal Basil Hume is untiring in his reminder that 12 million children under five die every year from hunger and disease.
5. He was untiring in his efforts to overcome racial divisions and gender inequalities.
6. She was an untiring worker in the Medau cause, and is much missed.
7. Added to this, he is an untiring worker.
8. Satisfaction of customers is just our untiring pursuit!
9. The devotion was obvious, untiring and without resentment.
10. He is an untiring campaigner for peace.
11. With great perseverance and untiring industry(sentencedict.com/untiring.html), he prospered.
12. They showed untiring zeal in the pursuit of truth.
13. Strive for further development with untiring efforts.
14. His enthusiasm seems untiring.
15. She is untiring in her effort to help the homeless.
16. As soon as the lights were out, these untiring nibblers set to work.
17. Only firm confidence and untiring efforts is the difficult path leading to victory.
18. So , with great perseverance and untiring industry, he prospered.
19. Our untiring commitment makes your trip the Best you've ever had.
20. Please provide tools for untiring the lashings . We'll return them to you after using.
21. Our development is originated from untiring pursuit and unceasing innovation.
22. None of the competitors could catch up with the untiring runner who was in the lead.
23. Books are more than educational – they are the quiet friends, loyal companions, and untiring teachers. Dr T.P.Chia 
24. A deceptively fragile and refined appearance belied her dedication and untiring industry in the cause of justice for women.
25. He had to follow the normal custom and even to force himself to show his well-known untiring interest in the ordinary business of a whaling captain.
26. We sincerely hope to found your perfect graphic arts with our untiring efforts!
27. Standard Methods as published today is the product of the untiring effort of hundreds of individuals.
More similar words: tiring, retiring, airing, firing, hiring, stirring, admiring, aspiring, inquiring, inspiring, enquiring, acquiring, perspiring, admiringly, despairing, soul-stirring, firing squad, uninspiring, inquiringly, awe-inspiring, despairingly, bunting, hunting, stunting, mounting, daunting, haunting, counting, taunting, grunting.