remorseless
adjective
[ rɪˈmɔːsləs ]
• without regret or guilt.
• "a remorseless killer"
Similar:
heartless,
pitiless,
merciless,
ruthless,
callous,
cruel,
hard-hearted,
stony-hearted,
with a heart of stone,
cold-hearted,
harsh,
inhumane,
unmerciful,
unforgiving,
unfeeling,
unpitying,
uncompromising,
unkind,
marble-hearted,
• (of something unpleasant) never ending or improving; relentless.
• "remorseless poverty"