Definition of "startlingly"

Afterwards I took it back when it was borne in upon me startlingly with what extreme nicety he had estimated the time requisite for the ‘affair.’

1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], part I, page 212

Economically, too, London is startlingly different. The capital, unlike the country as a whole, has no budget deficit: London’s public spending matches the taxes paid in the city. The average Londoner contributes 70 percent more to Britain’s national income than people in the rest of the country.

2013 September 28, Kenan Malik, “London Is Special, but Not That Special”, in New York Times, retrieved 28 September 2013

A man dressed as a lab tech, his blue scrubs startlingly pale against the vivid red and black chaos, moved into sight from behind the SUV. He carried an assault rifle.

2014, Jeff Jacobson, Growth, page 23