opponent

"The siblings were antagonistic toward each other, constantly arguing and competing for attention. "

"My friend told me there was something in the box, but I didn't know what it was yet. "

"During the crackdown, many opponents of the regime were arrested."

"The statue is situated in a corner hardly visible to the public, except through a window from an outside maintenance area situated behind the building."

"My brother's opinion is the opposite of mine on the best way to study for the exam. "

"My favorite position in the classroom is near the window. "

"It was worth the attempt."

"There is still time to oppose this plan."

"The city began a crackdown on illegal parking, issuing more tickets than ever before. "

"The sudden loud noise arrested the child's movement, causing him to freeze in place. "

"The student aggressively pursued the scholarship, attending every preparation session and studying late into the night. "

"Testing for the new antidote is currently in progress."