Use the adjective merciless to describe someone who acts in a cruel, heartless way. You could accuse your rabbit hunting brother of being merciless.
Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things;
Adjective
having or showing no mercy; "the merciless enemy"; "a merciless critic"; "gave him a merciless beating"
a.
Destitute of mercy; cruel; unsparing; -- said of animate
beings, and also, figuratively, of things; as, a merciless tyrant;
merciless waves.
Merciless
The foe is merciless, and will not pity.
Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things;
Usage Examples
Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.
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Other Usage ExamplesThought is subversive and revolutionary, destructive and terrible, Thought is merciless to privilege, established institutions, and comfortable habit. Thought is great and swift and free.