unrelenting

adj.

无情的；不松懈的；不屈不挠的；

1. This time the chase would be long and hard and unrelenting.
   这一次的追踪将是长期的、艰难的、不屈不挠的。
2. Her unrelenting efforts made the project a success.
   她坚持不懈地努力使计划获得了成功。

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Unrelenting pressure of protectionism : the 3rd GTA report; a focus on the Asia-Pacific region
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State privatization and the unrelenting expansion of neoliberalism: The case of the Greek financial crisis
A 55-year-old man with hypogammaglobulinemia, lymphopenia, and unrelenting cutaneous warts.
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Lightness, brightness and transparency: a quarter century of new ideas, captivating demonstrations and unrelenting controversy.