Unjustifiably
The Century Dictionary and Cyclopedia
In a manner that cannot be justified or vindicated.
Wiktionary, Creative Commons Attribution/Share-Alike License
adverb.
In an
unjustifiable
manner.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adverb.
without any excuse
Word Usage
"Also, Saudi Arabia says it wants meetings to discuss what it calls unjustifiably high crude prices."
Rhyme
Words with the same terminal sound
reliably
undeniably