The phrase "a highly exceptional" is correct and usable in written English.
It can be used to emphasize the uniqueness or outstanding quality of something.
Example: "Her performance in the competition was a highly exceptional display of talent and skill."
Alternatives: "an extremely remarkable" or "a particularly outstanding".
Prime Minister Tony Blair defended Queen Elizabeth II from widespread criticism over her role in the aborted trial of Paul Burrell, the former butler of Diana, Princess of Wales, and said he thought of the case as a "highly exceptional" one that did not require further investigation.
"We all recognise that the UK's membership of the EU is an issue on which some colleagues have long-standing, deeply-held positions of conviction - hence my decision to set aside, on a highly exceptional basis, the normal rules of collective responsibility.
"It is a highly exceptional situation when the victim of what appears to have been a murder is interviewed by police before he dies and makes a public statement in which he names those whom he suspects of being responsible for his death".
In his note, Cameron said he expected ministers to behave in a collegiate way during the "highly exceptional circumstances" of the EU referendum campaign, which is expected to last between 14 and 16 weeks.
Though not a great theme park by our standards, Khalifa Park's very poorly advertised dark ride is highly exceptional and worth a visit (especially since the cost is just under a dollar).
Yet, far from expressing wonder that an act as extreme and barbaric as the murders is what it takes for the west to show defiance towards a religious duty that is not meaningful to non-Muslims, cultural provocateurs successfully argue that this highly exceptional situation is in fact indicative of a general contempt for Islam.
From a physics point of view, Schrödinger argues, life seems something highly exceptional, aberrational even, compared to abiotic nature.
It would also ensure that a client who was caused loss by an expert witness acting in "an egregious manner" would receive a proper remedy; he said that such cases were likely to be "highly exceptional".
But the ruling at the European court of human rights confirmed that a power clearly exists in British law that provides those spending the rest of their lives in prison with the possibility of release in highly exceptional circumstances.
Her presence throughout was, of course, highly exceptional as far as the gendered division of labor went in Portuguese cinema in the 1920s.
"This is our host country; yes, we withdrew - on the basis that the Foreign Office assured us that it was highly exceptional and would not be repeated". For Mr du Plessis, business has absolutely no role in the political world.
