Synonym: cruel, firm, hard, harsh, heartless, inflexible, merciless, persevering, persistent, rigid, ruthless, steadfast, strict, uncompromising, unsympathetic, unyielding. Similar words: talentless, gentleness, pointless, careless, relent, unrelentingly, tactlessness, witless. Meaning: [rɪ'lentlɪs] 
adj. 1. not to be placated or appeased or moved by entreaty 2. never-ceasing.
adj. 1. not to be placated or appeased or moved by entreaty 2. never-ceasing. 
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1. The sun was relentless.
2. The minister's voice was a relentless drone.
3. This relentless pressure began to wear down their resistance.
4. The pressure now was relentless.
5. The traffic noise is relentless.
6. Sadly, despite the crazy antics and the relentless wisecracking, there's very little plot to carry this film.
7. A relentless campaigner(sentencedict.com), he was a thorn in the government's side for a number of years.
8. It is easy to feel trampled by the relentless march of technology.
9. Relentless in his pursuit of quality, his technical ability was remarkable.
10. The island is being destroyed by the relentless march of tourism.
11. She could not bear the relentless music and turned down the volume.
12. You have to be as single-minded and relentless as your rivals if you want to get to the top.
13. He is a relentless, buoyant, unabashed seeker of publicity.
14. Her critiques were relentless but revealing.
15. These spectacles are in fact subject to relentless change.
16. And my grandmother was a relentless lecturer on impermanence.
17. She found his relentless sexual innuendoes irritating.
18. He was relentless in pursuit of a story.
19. The arithmetic is relentless on this one.
19. Sentencedict.com is a sentence dictionary, on which you can find good sentences for a large number of words.
20. Hugh felt the relentless sun on his back.
21. She employed a relentless, deliberate, upward emotionalism that would have left Norman Vincent Peale feeling mild depression.
22. You have to focus with a kind of relentless determination on keeping your grip.
23. The modern suburban family has a relentless appetite for housing, supermarkets and motorways.
24. Then there were the relentless winds, hailstones bigger than oranges, tornadoes, and breathtaking thunderstorms.
25. Uncle Khan was a landlord with a relentless passion for raw, hard numbers.
26. The song is a fiery mix of twanging guitar with relentless drumming.
27. I know him to be nothing but a man of pleasure, a dandy who has given himself up to the relentless pursuit of sensual pleasure.
28. I didn't know how much longer I could hold out against their relentless questioning.
29. They are scrapes and sores, mockers of failure, players in a relentless team of agitation.
30. And suddenly, in the midst of the turmoil, everything steadied and locked into a slow relentless rhythm.
More similar words: talentless, gentleness, pointless, careless, relent, unrelentingly, tactlessness, witless, tactless, useless, tactlessly, nonetheless, homeless, hopeless, silently, tasteless, guileless, senseless, violently, changeless, insolently, nevertheless, malevolently, mantle, helen, at length, subtitles, release, reluctantly, nettlesome.