General Opposition:
* Counteract: To act against something in order to reduce its effect.
* Oppose: To be against something or someone.
* Resist: To refuse to accept or yield to something.
* Combat: To fight or oppose something.
* Antagonize: To make someone hostile or unfriendly.
* Contradict: To say or do something that is the opposite of what has been said or done before.
* Dispute: To argue or disagree with someone about something.
Pulling in the Opposite Direction:
* Counterbalance: To balance something by having something else of equal weight or force acting in the opposite direction.
* Countermand: To cancel an order or instruction.
* Repel: To drive something away or prevent it from coming closer.
* Repulse: To make someone feel disgusted or repelled.
* Reverse: To change something back to its original state.
* Retract: To take back something that has been said or done.
Other related words:
* Contrasting: Showing a clear difference between two things.
* Inverse: Opposite in position, direction, or effect.
* Antithetical: Directly opposite in meaning or character.
* Contrary: Opposite or different.
The best word to use will depend on the specific situation and the nuance you want to convey.