verb

1. To attempt to stop the progression of; to resist or antagonize by physical means, or by arguments, etc.; to contend against.

   “There is still time to oppose this plan.”

2. To object to.

   “Many religious leaders oppose cloning humans.”

3. To present or set up in opposition; to pose.

   “They are opposed to any form of hierarchy.”

Synonyms: against, bar, block, check, combat, confront, contest, contradict

adjective

1. That opposes or oppose; on the opposite side.

   “opposing armies”