Direct Opposites:
* Confrontation: Directly challenging or opposing someone or something.
* Resistance: Refusing to yield or submit to demands or pressure.
* Opposition: Active resistance or disagreement.
* Defiance: Bold resistance to authority or force.
Other Related Words:
* Retaliation: Responding to an attack or injury with a similar attack.
* Punishment: Imposing a penalty for wrongdoing.
* Sanctions: Penalties or restrictions imposed on a nation or organization for breaking international law or agreements.
* Retribution: Punishment for a crime or wrongdoing.
* Assertion: Stating a claim confidently and forcefully.
Words Emphasizing Strength:
* Force: Using power to achieve a desired outcome.
* Aggression: Hostile or forceful action.
* Vigor: Strength and energy.
* Determination: Resolute commitment to achieving a goal.
The best antonym will depend on the specific context in which "appeasement" is used. For example, if you're talking about political appeasement of an aggressor, "confrontation" or "resistance" might be appropriate. If you're talking about personal appeasement, "assertion" or "determination" might be better choices.