unforgivably
Adverb
Meaning
in an unpardonable manner or to an unpardonable degree
Source: WordNetSynonyms
inexcusably
unpardonably
wrongly
incompletely
clumsily
dreadfully
wickedly
excessively
wretchedly
disreputably
unduly
unreasonably
unforgivable
unjustifiably
inadequately
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Antonyms
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It makes me so desperately sad to witness just how unforgivably wretched our world has become.
he was inexcusably cruel to his wife