relent,缓和，-less,无，没有。

1. His relentless aggression bludgeons you into seeing his point.

他咄咄逼人地强迫你了解他的看法。

2. The song is a fiery mix of twanging guitar with relentless drumming.

那是一首夹杂着撩拨的吉他声和密集的鼓点的激情四射的歌曲。

3. Relentless in his pursuit of quality, his technical ability was remarkable.

对质量孜孜不倦的追求使他的技能出类拔萃。

4. It is easy to feel trampled by the relentless march of technology.

随着科技发展的日新月异，人们容易感到无所适从。

5. She could not bear the relentless music and turned down the volume.

她受不了没完没了的音乐，就把音量调小了。