Meaning : In an offensive and hateful manner.
Example :
I don't know anyone who could have behaved so abominably.
Synonyms : detestably, odiously, repulsively
Meaning : In a terrible manner.
Example :
She sings terribly.
Synonyms : abysmally, atrociously, awfully, rottenly, terribly
Abominably meaning in Bengali (Bangla).