General Antonyms:
* Inaction: This implies a lack of activity or movement.
* Passivity: This suggests a state of being acted upon rather than acting.
More Specific Antonyms:
* Courtesy: For polite behavior.
* Kindness: For compassionate or caring behavior.
* Honesty: For truthful behavior.
* Respect: For respectful behavior.
* Cooperation: For collaborative behavior.
Ultimately, the best antonym for "behavior" will depend on the specific context and the aspect of behavior you're focusing on.