"largely unexpected" is a correct and usable phrase in written English.
You can use it to describe something that has happened or something that you have found out, that was not anticipated in any way. Example: The news of her resignation came as largely unexpected.
But the size of the write-down was largely unexpected.
The outcome was largely unexpected, both at home and abroad.
Bernanke also notes that the deflationary spell was largely unexpected.
(The award was largely unexpected; among the other nominees was teen-idol pop singer Justin Bieber).
This level of violence was largely unexpected, and what lessons can we learn for the future?
Although Israel had been braced for violent protests, the clashes on its borders were largely unexpected.
It's a fitting theme for a show that has come together largely through unexpected twists: a producer revisiting characters he dreamed up two decades ago, a pilot reshot because of a major casting change, and a move to a time slot that was supposed to be spoken for indefinitely.
This result fits in well with in fact, it serves to explain—Husserl's view, already stressed in Ideas, that perceptual objects are "transcendent" in that at any given moment they display an inexhaustive number of unperceived (and largely even unexpected) features, only some of which will become manifest will be intuitively presented in the further course of observation.
Polymorphous, paranoiac, confused, yet intensely imaginative, the thinking layer of Earth that is largely the unexpected product of animal consciousness, may now be in its most impressionable stage".
Based largely on the unexpected strength in consumer spending, economists believe the economy grew at an annual rate of at least 6percentt in the quarter that ended Sept. 30.
When that effort failed (largely because of unexpected support for the plan from new field commanders like Gen. Dan McNeill, who saw the narcotics-insurgency nexus and were willing to buck their Pentagon minders), the Pentagon bureaucrats tried to prevent the release of an unclassified version to the public.
