antagonistic

adj

1. Contending or acting against.

   “They were distinct, adverse, even antagonistic.”

   “Though the tephrosia is a powerful agent, and, if carried too far beyond the antagonistic action of the poison, is, I presume, not entirely without danger, I have never known any bad symptoms to arise from its use.”

   “And deputies from opposing parties, inherently more antagonistic than deputies from the same party, can be bought at a lower price.”

   “The tone of congressional hearings involving tech industry executives in recent years can best be described as antagonistic.”

2. Relating to an antagonist.