The phrase "a most exceptional" is correct and usable in written English.
It can be used to emphasize the high quality or uniqueness of something, often in a formal or literary context.
Example: "Her performance in the play was a most exceptional display of talent and emotion."
Alternatives: "an extremely exceptional" or "a truly remarkable".
The spokesperson said: "We carry out thousands of cervical smear tests annually, and we would like to reassure all our patients that this is a most exceptional case.
It is a most exceptional product made in and by the first Black republic, a condiment so beloved once you have had it, nothing else will compare.
Michael's body is also feathered, stopping at the neck, ankles and wrists, a "most exceptional feature" often referred to as "feather tights", that perhaps borrows from the costumes of liturgical dramas.
It was their most critical crisis, their most exceptional exception.
Balmond has achieved a great reputation as a structural engineer, but his most exceptional talent may be a sort of genius for collaboration.
On a recent day, Di Sieno introduced a visitor to the predator she calls "a courageous girl and most exceptional mother".
The most exceptional was a plain, papaya-colored blouse worn with a neutral but tactile skirt.
This method looks at the most exceptional words a group uses to talk about themselves; white people's hair types come up because, by and large, other racial groups don't have blond or red hair.
At Izmir, we collectively invited the Court, "to avoid intervening except in the most exceptional circumstances".
According to Larry's list, he was now taking giant quantities of one of the most addictive painkillers around, an immensely popular black-market drug most doctors automatically avoid prescribing except under the most exceptional circumstances.
Where others might have rested on their laurels and cynically released a lowest-common-denominator disc of popular guitar music which would have inevitably sold gazillions, the industrious Miloš has instead gone back to what he has always done best – work, work, work – and has pushed himself to produce a new album Aranjuez, his most exceptional artistry yet.
