ad. In a manner without pause or stop, especially to the point of annoyance; not ceasing.
the GNU version of the Collaborative International Dictionary of English
ad. Unceasingly; continually.
The Century Dictionary and Cyclopedia
In an incessant manner; with constant repetition; unceasingly.
Instantly; immediately.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. without interruption
ad. with unflagging resolve
Word Usage
"I used to complain incessantly when my mother made me write thank-you notes Christmas day and my birthday - I was not allowed to play with anything until they were done (usually only about 10 to do)"