inexcusable
inex·cu·sable
adjective
1.
without excuse or justification
2.
not excusable
Origin
From Middle French inexcusable, from Latin inexcusabilis.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.