diametrically

vastakkain Separated by a diameter, on exactly the opposite side.
puhekieltä absolutely (in opposition).
2013 September 28, w:Kenan Malik|Kenan Malik, "http://www.nytimes.com/2013/09/29/opinion/sunday/london-is-special-but-not-that-special.html?ref=opinion London Is Special, but Not That Special," New York Times (retrieved 28 September 2013):

The distinctness of London has led many to clamor for the capital to pursue its own policies, especially on immigration. The British prime minister, David Cameron, is a Conservative. So is the mayor of London, Boris Johnson. But they have diametrically opposed views on immigration.