"blurred relationship" is a correct and usable phrase in written English.
You can use it to refer to a situation in which the boundaries of a relationship are not clear or well-defined. For example, "The blurred relationship between teacher and student made it difficult to define expectations and rules for the classroom."
Often the explanation is traceable to the liberal-left's justified concerns about the blurred relationship between religion and state.
Sir Gus O'Donnell's report into Liam Fox's "blurred" relationship with Adam Werritty, leaves several important questions unanswered: The report says Fox did not benefit financially from the relationship.
Suddenly, decades of blurred relationship boundaries turned crystal clear, years of confusion over entanglements, projections, and taking things personally that weren't.
By the 1960s, the blurred relationship between the MRC and the Ministry (from 1966, the Department of Health and Social Security, DHSS) reflected a wider debate in government about the best way to undertake publicly funded research.
Conflicting loyalties blurred relationships between the two sides: John Jay, a delegate to the Continental Congresses, had a brother whose political loyalties leaned toward the Crown, while one of the daughters of Continental Army general William Alexander lived in occupied New York City with her husband, a prominent Loyalist.
Another limitation of the study is the crude measurements of physical activity, which also could have blurred the relationship between BMI and physical activity.
It is possible that some of the high BMI observed might be due to muscular mass rather than body fat, which could have blurred the relationship between BMI and physical activity.
Since the Tupi expansion involved language replacement, it may have blurred the relationships between genes and languages.
The forthcoming release of Lionhead Studios' The Movies will blur the relationship between game and cinema even more by including a powerful "movie-making" toolkit.
The convergence of these talent trends is producing a huge change in behavior that's sawing away at the corporate ladder, blurring the relationship between work and life and redefining what it means to build a career.
The final presentation, from Grettis Saga Ásmundarsonar, presents a hybrid model, which blurs the relationship between the historical and the fantastic through the character of Grettir, who inhabits both the human and non-human environments of the saga with equal discomfort.
