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. adjective
    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
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    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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