ad. In an unalterable manner; in a manner that makes it impossible to be altered.
The Century Dictionary and Cyclopedia
Unchangeably; immutably.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in an unalterable and unchangeable manner
Word Usage
"On the other hand there were those who said new START was really an end because any further treaty would have to consider Russian demands to limit ballistic missile defense, an issue upon which the two sides seemed unalterably divided."