a. 无怜悯之心的, 冷酷的, 不知自责的

[ adj ]
without mercy or pity
<adj.all>
an act of ruthless ferocitya monster of remorseless cruelty

Remorseless \Re*morse"less\, a.
Being without remorse; having no pity; hence, destitute of
sensibility; cruel; insensible to distress; merciless.
``Remorseless adversaries.'' --South. ``With remorseless
cruelty.'' --Milton.

Syn: Unpitying; pitiless; relentless; unrelenting;
implacable; merciless; unmerciful; savage; cruel.
※ -- {Re*morse"less*ly}, adv. --
{Re*morse"less*ness}, n.