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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91. her relentless pursuit of perfection.
92. His quest for perfection is relentless.
93. His relentless aggression bludgeons you into seeing his point.
94. Neither constancy nor relentless change will support a creation.
95. Once more the relentless tide drove him back.
96. Open trades are a relentless feedback loop.
97. NARRATOR: The baht came under relentless market pressure.
98. Fear, that relentless pursuer, clogged Dant è s'efforts.
99. I'm proud of them because that investigation was relentless.
100. He was relentless in demanding repayment of the debt.
101. A basketball lifer, Jerry was as relentless in his will to win on the sidelines for the Utah Jazz as he was as an All-Star guard for the Chicago Bulls.
102. Shopping for her layette, I grumbled over the relentless color coding of babies.
103. Was it possible that there could be such relentless unforgiveness.
104. Desire had turned me into a relentless hunter for clues, a romantic paranoiac, reading meaning into everything.
105. That conjures up images of constant and relentless forward movement orchestrated with military precision.
106. Tumor growth is slow but its clinical course is relentless and progressive. ACC is the propensity for perineural invasion and distant spread to the lungs and bones is frequent.
107. China's focus on science and technology is relentless, and it's occurring at all levels of its society, writes Computerworld.
108. Is this sort of relentless criticism of the president's tardiness too tough?
109. This research facility is trying to harness those relentless rays.
110. The swashbuckling birds sometimes theirand they are relentless in chasing down their adversaries.
111. He thrived on this,(http://sentencedict.com/relentless.html) but after 17 years I didn't like what the relentless production of a newspaper column was doing to my writing.
112. The flip side of relentless mobility is turmoil and angst, broken marriages and unhappy children.
113. The bulk of the "blue-white" file consists of a relentless catalogue of civilian shootings on nearly 100 occasions by jumpy troops at checkpoints, near bases or on convoys.
114. The Taking is a relentless rollercoaster ride; a story of terror, heartbreak and triumph.
115. Reporting from Beijing -- The private eyes in China's most famous detective agency rarely sleep, are relentless in pursuing their prey and can put Interpol and Homeland Security to shame.
116. Every bamboo blind was drown to keep out the relentless sun.
117. It's relentless commercialism embarrassed the Olympic movement, and worse, left no benefit the local people.
118. Aah, summer? the season of relentless sun and oppressive heat.
119. Despite relentless criticism until his administration ended in 1963, Adenauer stuck firmly to this stance.
120. Perhaps the most relentless enemy of achievement or personal growth or success is inflexibility.
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.