The phrase "astonishing relationship" is correct and usable in written English.
It can be used to describe a relationship that is surprising or remarkable in some way, often evoking a sense of wonder or admiration.
Example: "Their astonishing relationship defied all odds, showcasing the power of love and understanding."
Alternatives: "remarkable connection" or "incredible bond".
In Chubut they found fresh water, and it was here that an astonishing relationship was formed: between them and the Tehuelche Indians.
I'm entering my 25th year of an astonishing relationship with my wife, so that is something that doesn't enter my mind any more – that Earl of Rochester lifestyle that I had prior.
Antonia Maury not only helped reveal the existence of stars orbiting each other, but produced a seminal system of classification; while Henrietta Swan Leavitt, scrutinising variable stars known as cepheids, hit upon an astonishing relationship: the brighter the star, the longer the time period between its brightest phases.
Because – while technological and scientific progress is indeed an astonishing thing – its relationship with human progress is more aspiration than established fact.
She "examines in astonishing detail the ambivalent relationship between a brainy, overachieving black woman and other blacks".
Ms Zinovieff's narrative tone is cool and clear enough to let its astonishing characters, and her relationship with them, come alive; that makes for a compelling read.
The book traces her journey across borders of class and race to the lonely promontory where she lands, and examines in astonishing detail the ambivalent relationship between a brainy, overachieving black woman and other blacks.
But I'm grown up now, and have a child of my own, and I rely on her books, her pinprick insights into familial relationships, her astonishing way of seeing the worlds.
You might recall that in February 2014 it was Walters who broke the astonishing tale about the close relationship between Murdoch's former wife, Wendi Deng, and Tony Blair based on a cache of emails between the pair.
Recently, an astonishing and never before observed relationship between this dung beetle (Thorectes lusitanicus) and two oak species (Quercus suber and Q. canariensis) has been described for the Iberian Peninsula [18], [19].
November's six-month deal between Washington and the new government of Hassan Rouhani in Tehran represented an astonishing turnaround in an increasingly belligerent relationship.
