• WordNet 3.6
    • adj merciless having or showing no mercy "the merciless enemy","a merciless critic","gave him a merciless beating"
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Webster's Revised Unabridged Dictionary
    • a Merciless Destitute of mercy; cruel; unsparing; -- said of animate beings, and also, figuratively, of things; as, a merciless tyrant; merciless waves. "The foe is merciless , and will not pity."
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Century Dictionary and Cyclopedia
    • merciless Destitute of mercy; unfeeling; pitiless; hard-hearted; cruel; relentless; unsparing: as, a merciless tyrant.
    • merciless Without hope of mercy.
    • merciless Synonyms Unmerciful, severe, inexorable, unrelenting, barbarous, savage.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Merciless without mercy: unfeeling: cruel
    • ***


  • Neil Kendall
    Neil Kendall
    “Some people follow their dreams, others hunt them down and beat them mercilessly into submission.”
  • Thomas H. Huxley
    “Science is simply common sense at its best--that is, rigidly accurate in observation, and merciless to fallacy in logic.”
  • Bertrand Russell
    “Thoughts is subversive and revolutionary, destructive and terrible; thought is merciless to privilege, established institutions, and comfortable habit.”


Chambers's Twentieth Century Dictionary
Fr. merci, grace—L. merces, mercedis, pay, in later L. also 'favour.'


In literature:

She made a sharp movement with her head in an effort to avert her face, but the light was merciless, there was no shade to hide in.
"The Emigrant Trail" by Geraldine Bonner
Back at the base he had been matched with Ashe, and before Ashe with the tough-bodied, skilled, and merciless trainers in unarmed combat.
"The Time Traders" by Andre Norton
The wilderness is bigger than we are, and it's merciless if we make mistakes.
"North of Fifty-Three" by Bertrand W. Sinclair
Standing there as if waiting for her, very quiet, apparently quite unemotional, he was like a lifeboat in a merciless sea.
"The Guests Of Hercules" by C. N. Williamson and A. M. Williamson
Their employers are merciless in their treatment of them.
"Lights and Shadows of New York Life" by James D. McCabe
God's mercilessness begins when our mercifulness ends.
"Serbia in Light and Darkness" by Nikolaj Velimirovic
I had mercilessly bruised that tender plant, and there was nothing in my hands to heal the wounds I had made!
"The Priest, The Woman And The Confessional" by Father Chiniquy
Society had waged war on him; he would be merciless in his war on society.
"The Mask" by Arthur Hornblow
The merciless lead pursues them.
"On the Heels of De Wet" by The Intelligence Officer
Henry VI was a ruler dreaded by contemporaries as merciless to the last degree.
"Heroes of Modern Europe" by Alice Birkhead

In poetry:

WOE to the rich, and mercilessly-proud,
Who stops his ears against the beggar's cry!
Unheard, unpity'd, he shall cry aloud
From Hell's abyss, where he shall ever lie.
"Advice To Distribute To The Poor, According To Every One's Circumstances And Abilities" by Rees Prichard
Not the mad woman’s pain, but the willow
Is awaking my heart’s even sadness,
‘Cause, while lulling this pain on leaves’ pillows,
It was tired and cut by winds merciless.
""My Life's Burden..."" by Innokentii Fedorovich Annensky
Still the gale blew hard, and the waves ran mountains high,
While men, women, and children bitterly did cry
To God to save them from the merciless fire;
But the flames rose higher and higher.
"The Burning of the Ship 'Kent'" by William Topaz McGonagall
The barque "Nor" was bound from New York to Stettin,
And when she struck the "Saxmundham," oh! what terrible din!
Because the merciless water did rush in,
Then the ship carpenters to patch the breach did begin.
"The Collision in the English Channel" by William Topaz McGonagall
But before they left the barque, they thanked God that did them save
From a cold and merciless watery grave;
Also the Captain received their thanks o'er and o'er,
Whilst the big waves around the barque did sullenly roar.
"The Burning of the Steamer 'City of Montreal'" by William Topaz McGonagall
Then the captain cried, Lower down the small boats,
And see if either of them sinks or floats;
Then the small boats were launched on the stormy wave,
And each one tried hard his life to save
From a merciless watery grave.
"The Wreck of the Steamer 'London', while on her way to Australia" by William Topaz McGonagall

In news:

Two kittens who were thrown mercilessly into a a bag and then dumped in the middle of the road are now available for adoption from and Iowa rescue group.
Another date with merciless Martina Hingis in a final-round match, another blur with an unhappy ending.
As one of the premier fake journalists on the planet, Stephen Colbert is struck by the reaction of those he mercilessly ridicules.
Not even the dead could rest in peace during Hurricane Sandy’s merciless rage.
Morrissey Goes on Colbert, Gets Teased Mercilessly (Video).
Having it your way doesn't often apply to light switches, which are mercilessly uniform.
The pairing of Titus Andronicus and Ceremony at the Irenic on Nov 10 was a mercilessly passionate, sweat-soaked and heartfelt showcase of the direction of modern punk music.
A South African judge sentenced the triggerman in the 2010 honeymoon slaying of a Swedish bride to life in prison Wednesday, calling the shooter "a merciless and evil person" who deserved the maximum punishment for his crime.
Much credit should go to "Saturday Night Live," which mercilessly made him a joke for his ethics, his intelligence, his salty language and his hair.
In this action-packed western movie, an ex-slave sets out with his mentor to save his wife from a merciless plantation owner.
Celebrity scents are all the rage, with many starlets slapping their name on bottles of perfume , appearing in print ads and hawking them mercilessly.
My heart broke with her story about how doubt began to shoot up in the fertile soil of merciless legalism.
BALTIMORE — The New York Yankees now must grudgingly acknowledge that these aren't the same Baltimore Orioles they used to knock around with merciless ease.
David Rockefeller 's memoir is hardly merciless on his father, but it is anything but loving.
While the torturing heat is so merciless it seems it could eat away at somebody 's soul, Texans players have hit the field for training camp everyday this week.

In science:

In 1918 an epidemic influenza started in Spain raided the world and reached Caracas “ One case, two, three, six, a hundred, on the Capitol it fell like fog, the raid swept mercilessly from outskirts to center” (my translation of a passage by Pocaterra ).
A procedure to Estimate the Fractal Dimension of Waveforms