The phrase "unyielding insistence" is correct and usable in written English.
It can be used to describe a strong, steadfast assertion that one believes in, regardless of opposition. For example, "Despite the criticism he received, the CEO maintained an unyielding insistence on modernizing the company's technology."
Fiscal expansion is similarly blocked by Germany's unyielding insistence on strict budgetary discipline.
But each time, their hopes foundered on Mr. Assad's unyielding insistence that all territory held by Syria prior to June 1967 be returned.
Francis' followers would spend the next two centuries threatening papal power and authority with their unyielding insistence on apostolic poverty.
But Congress, much less the highest court in the land, would never go along with whittling away at their cherished fiefdoms, where they wield inordinate power, without the firm and unyielding insistence of 'the people.'.
Perhaps one of the more traditional and gratifying modern applications of old-style dadhood is in utilizing your reservoir of patience on the endless spirals of foreign tech support representatives, punctuated by spasms of well-timed anger and unyielding insistence upon talking to the MANager.
In the case about public school diversity, he rejected colorblindness as a basis for the court's decision, calling it an "all-too-unyielding insistence that race cannot be a factor in instances when, in my view, it may be taken into account".
Federal officials were unyielding in their insistence that the requirements of No Child Left Behind be honored.
He was unyielding in his insistence on judicial independence, which he interpreted as requiring protection of the judges from the impact of public criticism.
He constantly fought with editors over how his photos were used, unyielding in his insistence that his images be exactly true to his vision despite any editorial, commercial or even space constraints editors faced.
Ayatollah Sistani, a relative moderate, has been unyielding in his insistence on some form of direct elections to assure that Iraq's Shiite majority cannot again be cheated out of its fair share of political power.
While considerable progress has been made, Greece's financial backers — Germany and the International Monetary Fund — have been unyielding in their insistence that the longer-term bonds that would replace the current securities must carry yields in the low 3 percent range, officials involved in the negotiations said on Sunday.
