"increasingly diminished" is a correct and usable phrase in written English.
You can use it when something has been getting smaller or weaker over a period of time. For example, "The company's profits have been increasingly diminished over the past year."
If so, welcome to the increasingly diminished world of French racing.
By appropriating more and more of this planet with our growing numbers and our technology, humans are effectively condemning other life on earth to an increasingly diminished existence.
The relevant issue today is not which is the good nationalism, inclusive or majoritarian, but whether one can have a democratic polity at all when the domain of civil society is increasingly diminished by the state's actions.
In many ways, Africa would seem a lower priority for Benedict, who in his four years as pope has been deeply preoccupied with strengthening the church in Europe, where its status is increasingly diminished.
That could reverse months of damage-repair efforts by Mr. Dooner and Sean F. Orr, the executive vice president and chief financial officer, whose assiduous courting of investors and analysts was met recently with increasingly diminished returns.
Americans now pay less for their petrol, and the oil being pumped from states including Texas and North Dakota has increasingly diminished oil cartel Opec's ability to control global prices.
Either they can lumber on to increasingly diminishing returns, or they can simply bite the bullet.
Points are amassed throughout the regular season feeding into a four-tournament finale in September with increasingly diminishing fields.
Their work is all the more commendable given the intimidation faced for rebuilding the homes of ethnic Uzbeks, and an increasingly diminishing budget.
The result is denominationalism in which each Protestant church tries to be just different enough from other Protestant churches to attract an increasingly diminishing market share.
We also observed that the overall interactions between the families are siloed - kids and parents have their own devices and apps, but the overall time spent with each other in the family is increasingly diminishing.
