the GNU version of the Collaborative International Dictionary of English
ad. In a guilty manner.
The Century Dictionary and Cyclopedia
In a guilty manner.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in the manner of someone who has committed an offense
Word Usage
"The last time we did this, Sage was not even a year old, and it wasn't so bad (Nikki and I only gave in guiltily during a local flight from New York to Las Vegas and gave Sage sleep-inducing medicine)."