Wordnet 3.0
ADVERB (1)
1.
in an antagonistic manner;
- Example: "he behaves antagonistically toward his colleagues"
The Collaborative International Dictionary of English v.0.48:
Antagonistic \An*tag`o*nis"tic\, Antagonistical
\An*tag`o*nis"tic*al\, a.
Opposing in combat, combating; contending or acting against;
as, antagonistic forces. -- An*tag`o*nis"tic*al*ly, adv.
[1913 Webster]
They were distinct, adverse, even antagonistic.
--Milman.
[1913 Webster]
WordNet (r) 3.0 (2006):
antagonistically
adv 1: in an antagonistic manner; "he behaves antagonistically
toward his colleagues"