unrelenting

1. ADJ If you describe someone's behaviour as unrelenting, you mean that they are continuing to do something in a very determined way, often without caring whether they hurt or embarrass other people. 不留情面地坚持的

She established her authority with unrelenting thoroughness. 她以彻底的一丝不苟树立了自己的权威。

2. ADJ If you describe something unpleasant as unrelenting, you mean that it continues without stopping. 无休止的 (不愉快的事情)

...an unrelenting downpour of rain. …一场下不停的倾盆大雨。