detestably
Adverb
Meaning
In a detestable manner.
Source: Webster's dictionarySynonyms
abominably
repulsively
odiously
grossly
horribly
awfully
dreadfully
deplorably
foully
contemptibly
terribly
hideously
atrociously
horridly
despicably
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Antonyms
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I don't know anyone who could have behaved so abominably