grievously

grievous +‎ -ly

grievously (comparative more grievously, superlative most grievously)

1. In a grievous manner, severely.
   • 2011 November 21, David Gergen, “Have they gone nuts in Washington?”, in CNN.com‎:

     That's why this failure of the super committee represents a reckless, irresponsible gamble by our "leaders" in Washington. It's difficult to remember a Congress that has put the nation so much at risk in the service of ideology and to hold onto office. Partisans on both sides are grievously failing the country.