The Collaborative International Dictionary
Antagonistical
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.
They were distinct, adverse, even antagonistic.
--Milman.
Wiktionary
antagonistical
a. (alternative form of antagonistic English)
Usage examples of "antagonistical".
These two antagonistical principles were at perpetual variance, it being the law of one to counteract whatever the other did.