the GNU version of the Collaborative International Dictionary of English
ad. In a sound manner.
The Century Dictionary and Cyclopedia
In a sound manner, in any sense of the word sound.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. deeply or completely
ad. completely and absolutely (`good' is sometimes used informally for `thoroughly')
Word Usage
"To keep the economies of Canada and the United States expanding steadily and soundly is also going to require sound and confident forward planning by private business."