"abominably" in the adverb sense
1. detestably, repulsively, abominably, odiously
in an offensive and hateful manner
"I don't know anyone who could have behaved so abominably"
2. terribly, atrociously, awfully, abominably, abysmally, rottenly
in a terrible manner
"she sings terribly"
Source: WordNet® (An amazing lexical database of English)
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