Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things; as, a merciless tyrant; merciless waves. [1913 Webster]

"The foe is merciless, and will not pity." [1913 Webster]

Syn. -- Cruel; unmerciful; remorseless; ruthless; pitiless; barbarous; savage.

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OXFORD DICTIONARY

merciless, adj.
1 pitiless.
2 showing no mercy.

Derivative

mercilessly adv. mercilessness n.

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THESAURUS

merciless

atrocious, barbarian, barbaric, barbarous, bestial, bloody, bowelless, brutal, brutish, callous, cold, crude, cruel, cutthroat, dog-eat-dog, feral, ferine, ferocious, fierce, hard, harsh, heartless, illiberal, implacable, inclement, inconsiderate, indifferent, inexorable, inflexible, inhuman, inhumane, insensitive, kill-crazy, malevolent, malign, malignant, mortal, murderous, noncivilized, pitiless, relentless, remorseless, rough, rude, ruthless, sanguinary, savage, severe, tameless, thoughtless, tough, tyrannical, unappeasable, unbending, uncalled-for, uncharitable, uncivilized, uncompassionate, uncompassioned, unfeeling, unflinching, unforgiving, ungentle, ungracious, unmerciful, unmoved, unpitiful, unpitying, unrelenting, unremorseful, unsparing, unsympathetic, unsympathizing, untamed, unyielding, vicious, wanton, wild, without mercy

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ROGET THESAURUS

merciless

Pitilessness

N pitilessness, inclemency, severity, malevolence, pitiless, merciless, ruthless, bowelless, unpitying, unmerciful, inclement, grim-faced, grim-visaged, incompassionate, uncompassionate, inexorable, harsh, unrelenting.

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