The phrase "relentless obsession" is correct and usable in written English
You could use it to describe a person's attitude when they are very passionate and focused on something: "John has a relentless obsession with getting the highest grade in the class."
The worst, however, were Daphne's falling-down, passing-out drug binges and her relentless obsession with sex, which she shockingly shared with her young daughter.
Possibly it is — at a time of such relentless obsession on work-family "balance," an obsession that leaves little cultural room to think about more pleasurable kinds of human engagement.
Ms. Jong-Fast sums up contemporary New York City when she writes: "Nothing ever really changes.... Maybe disco has become techno, promiscuous sex has morphed into cautious promiscuous sex and cell phones have replaced religion as the opiate of the masses, but our relentless obsession with The Next Big Thing-ism (T.N.B.T.-ism) remains the same".
His ambition to be lauded as the world's greatest is well documented, and it's easy to understand how such a relentless obsession can easily spill over into introspective self-indulgence.
With relentless obsession over all things web and social media, Amoruso has propelled her brand's unforgettable aesthetic on every channel including a half a million followers on Facebook and six-hundred thonsand followers on Instagram.
At a Civil Affairs Symposium last November, Lt. Gen. H.R. McMaster, deputy commander of the Army's Training and Doctrine Command -- and among the military's top thinkers -- critiqued the Pentagon's relentless obsession with firepower, technology, and tactics over strategy.
I wouldn't have indulged Eileen's relentless self-obsession.
Be relentless and obsessive.
They are continuously inventive, and relentless in their obsessions — about forgery, and the meaninglessness of money, and the stupid convolutions of business-speak, and the frustrated aspirations of any artist who wants to create something genuine and original.
"Cult" Investigative journalist Jeff Sefton has learned to laugh off his brother Nate's relentless string of obsessions, especially his latest rant that a hit TV show intends to harm him.
The paper's former editor, Simon O'Neill, recalled: "She had a relentless work ethic, an obsession with accuracy and a great eye for a headline".
