"relentless devotion" is correct and usable in written English.
It can be used to describe strong, unwavering dedication to something or someone. For example, "Mike's relentless devotion to his children knows no bounds."
Even more generous souls sometimes grew testy with Harrison's relentless devotion to sweetness and beauty, born of his California spirit and his lifelong interest in the music of the Pacific Rim, especially Asia.
Chita Rivera and Sidney Poitier, cited by the White House for their "relentless devotion to breaking down barriers," are among the 16 people to whom President Obama will award the Presidential Medal of Freedom in Washington next week in recognition of their work as "agents of change".
It meant having an unimpeachable technical founder, 10X engineers, a relentless devotion to computing dominance.
Jessica Olah, a 30-year-old artist who lives in Brooklyn, New York, spent five days making peanut butter and jelly sandwiches as part of an art installation at community bodega Specials on C. The 30-year-old made 2,340 -- approximately the number that her mother, Elizabeth, made for her while she was growing up -- to show appreciation for mom's relentless devotion to her. .
But Mr. Kass, with his relentless questioning and devotion, suggests that one way to find first principles is to begin by taking the idea seriously.
The Economist, relentless in its devotion to unbiased reporting, has vowed to eschew "agent metaphors"—at least in this article.Agent metaphors are those in which words normally applied only to animate beings are used in an inanimate context, such as the stockmarket.
The fury of Donissan's religious devotion, an utterly non-amiable, relentless quest for Christian suffering, alienates his parishioners even as he seems to sense the presence of the Devil more clearly than that of God.
His relentless optimism, passion for his work, and devotion to his family and friends were regular reminders to us all of what it means to embrace and enjoy life.
Help me understand this fanatical devotion to gun rights in the face of this senseless and relentless death by guns.
Their amusing expression of devotion in the "Timeless to Me" duet and foxtrot offers an easygoing respite from the show's relentless propulsion.
It means "total devotion".
