General Antonyms:
* Inaction: This is the most direct opposite, meaning a lack of action.
* Passivity: This suggests a state of being inactive or not taking any initiative.
* Inertia: This implies a resistance to change or movement.
Antonyms in specific contexts:
* Reaction: This implies a response to something, rather than taking the initiative.
* Waiting: This is the opposite of taking action, instead choosing to observe or delay.
* Thinking: If "action" refers to physical activity, "thinking" could be the opposite, focusing on mental activity.
It's important to consider the specific context in which you are using the word "action" to determine the best antonym.