unforgivably
adv.
in a manner that can not be forgiven, in an unforgivable manner
unforgivably
Adverb
1. in an unpardonable manner or to an unpardonable degree; "he was inexcusably cruel to his wife"
(synonym) inexcusably, unpardonably
(antonym) excusably, forgivably, pardonably
(pertainym) inexcusable, unforgivable
UNFORGIVABLY
IN MODO IMPERDONABILE