It was a truceless, merciless combat.
"The Fortune of the Rougons" by Emile Zola
His life was one long truceless war.
"The Love Affairs of Great Musicians, Volume 2" by Rupert Hughes
An implacable and truceless war broke out between them.
"History Of Egypt, Chaldæa, Syria, Babylonia, and Assyria, Volume 6 (of 12)" by G. Maspero
Like all young schoolboys, Martin regarded a master or crusher as a natural foe, a person with whom truceless war is waged.
"Years of Plenty" by Ivor Brown
It was the deathless, truceless courage of a moral hero.
"Abraham Lincoln's Cardinal Traits;" by Clark S. Beardslee