adv.无情地,残忍地
You know you are liable to be cross-examined mercilessly about the assault.
你要清楚他们可能会就这起人身侵犯案毫不留情地盘问你。
We teased him mercilessly.
我们肆无忌惮地拿他开心。
The sun beat down mercilessly.
阳光无情地照射下来。