remorselessly

The army advanced remorselessly across the border, ignoring all international pleas for peace.

(Chinese) 军队毫不留情地越过边界推进，无视国际社会的所有和平请求。

The sun beat down remorselessly on the stranded hikers, leading to severe dehydration.

(Chinese) 太阳无情地直射在被困的徒步旅行者身上，导致了严重的脱水。