merciless

Use the adjective merciless to describe someone who acts in a cruel, heartless way. You could accuse your rabbit-hunting brother of being merciless.

Merciless is the antonym, or opposite, of "merciful." If a person shows no mercy or pity, she is merciless. This can describe a cruelly violent person, or it can be more figurative: "The torrential rain was merciless, pouring down on the wedding party as they ran to take cover." The root word is mercy, which comes from the French merci, "reward, gift, or kindness."

DEFINITIONS OF: merciless

1

adj having or showing no mercy

“the merciless enemy”
“a merciless critic”
“gave him a merciless beating”
Synonyms:
unmerciful
bloody
having or covered with or accompanied by blood
inclement
used of persons or behavior; showing no clemency or mercy
uncompassionate
lacking compassion or feeling for others
hard
dispassionate
unkind
lacking kindness
bowelless, cutthroat, fierce
ruthless in competition
mortal
unrelenting and deadly
pitiless, remorseless, ruthless, unpitying
without mercy or pity
tigerish
resembling a tiger in fierceness and lack of mercy
implacable
incapable of being placated
Antonyms:
merciful
showing or giving mercy
clement
(used of persons or behavior) inclined to show mercy
compassionate
showing or having compassion
soft
compassionate and kind; conciliatory
humane
marked or motivated by concern with the alleviation of suffering
kind
having or showing a tender and considerate and helpful nature; used especially of persons and their behavior
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