"an outsized" is a correct and usable phrase in written English.
It typically refers to something larger than usual or expected in size. For example, "The room had an outsized window, letting in more light than usual."
Closed plants occupy an outsized amount of psychic space.
"It's taken an outsized role in employment, housing and insurance".
On regulation, there is an understandable fear that an outsized financial-services industry means an outsized risk for taxpayers.
And Mr. McNeely brought an outsized showmanship to the proceedings.
It has had an outsized influence beyond that territory.
Even Saatchi seems an outsized version of himself.
Genetic mutations affecting a single gene play an outsized role in Parkinson's disease.
But ecologists have begun to wonder if lianas might play an outsized role in the forest.
The lack of clean water at the school has an outsized impact on female students.
From catalysis, we know that minority faces can have an outsized impact on chemistry.
A banquet takes place in the courtyard of an outsized palatial structure.
