the GNU version of the Collaborative International Dictionary of English
ad. In a nasty manner.
The Century Dictionary and Cyclopedia
In a nasty manner; filthily; dirtily; disagreeably; unpleasantly.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in a nasty ill-tempered manner
Word Usage
"But the real fear here is that when the real economies in the U.S. and in Europe start slowing, the consensus is they are going to slow pretty nastily, that is going to have a major knock-on affect to Asia."