"relentless use of" is a grammatically correct phrase and can be used in written English.
It means using something continuously and without stopping, often in a forceful or persistent manner. Example: The teacher's relentless use of group work in class allowed the students to develop strong teamwork skills.
One of the pleasures of "Rushmore" was its deft, relentless use of pop music.
Republican Senators challenged the now-defeated Democratic majority through relentless use of quorum calls, motions to reconsider and other lawyerly devices from the chamber's rulebook.
And the relentless use of sophisticated weaponry, particularly our unparalleled air power, against an impoverished agrarian society is a permanent stain on American history.
And yet, what might have been a graceful prose voice is marred by the author's relentless use of "Caucasian" and "Afro-American".
Compounding all this is the relentless use of the Sedition Act, a vague and noxious law left over from the British colonial era, to harry growing numbers of activists and opposition leaders.
The "relentless use of injunctions, in particular by [América Móvil]…has replaced, to a large extent, the right and responsibility of government to implement economic policy and regulation," it says.This has cost Mexico dearly.
The relentless military mobilization and unforgiving use of force killed 96 people in recent days, leaving more than 1,000 unarmed protesters dead since the popular protests started in mid-March, human rights activists said Thursday.
Yet for all its sometimes relentless whimsy, the use of some outdated pejorative words dates a piece which is otherwise freshly eccentric.
Politicians are alienating GPs with "relentless attacks" and use of "political gimmickry" to tackle the unsustainable pressures facing family doctors, a key leader of the profession warns on Thursday.
Through relentless campaigning and exemplary use of social media, the SNP has made fervent supporters out of nationalist sympathisers, many of them working-class Scots who always voted Labour.
By Andy Borowitz October 5, 2012 NEW YORK (The Borowitz Report) — Taking a victory lap after their candidate's win in the first Presidential debate Wednesday night, Romney campaign insiders today attributed his success to his strategic use of relentless lying.
