The strange, upheaving, lifting tendency of the taffrail breeze filling the hollows of so many sails, made the buoyant, hovering deck to feel like air beneath the feet; while still she rushed along, as if two antagonistic influences were struggling in her—one to mount direct to heaven, the other to drive yawingly to some horizontal goal.
There are no more uses of "antagonist" in the book.
Show samples from other sources
She is my forever antagonist.
Gillian Flynn -- Gone Girl
They could have done him no real harm, of course, but the shock and pain of having a number of his toes nipped simultaneously by an unknown antagonist must have been considerable.