Antagonist

Caffeine is a purinergic antagonist that competitively inhibits adenosine at the sites of P1 receptors.

The antagonist of the book was introduced on the second page.

Despite being the antagonist in the movie, I liked her character.

The antagonist is simultaneously a strawman for everything the author hates and the most likeable character by several orders of magnitude.

You know my powers, my dear Watson, and yet at the end of three months I was forced to confess that I had at last met an antagonist who was my intellectual equal.

Colonel Ashton, frantic for revenge, was already in the field, pacing the turf with eagerness, and looking with impatience towards the Tower for the arrival of his antagonist.

The second shot of the scene features the protagonist and antagonist transposed, alluding to their similarities.

Mr. Mercer, who in 1846 was the principal civil officer of Government at Badulla, sent me a jagged fragment of an elephant’s tusk, about five inches in diameter, and weighing between twenty and thirty pounds, which had been brought to him by some natives, who, being attracted by a noise in the jungle, witnessed a combat between a tusker and one without tusks, and saw the latter with his trunk seize one of the tusks of his antagonist and wrench from it the portion in question, which measured two feet in length.

Lukas is the antagonist of the film.

I am now their antagonist.