General Antonyms:
* Inaction
* Passivity
* Inertia
* Stagnation
* Immobility
* Quietude
* Rest
* Dormancy
Antonyms in specific contexts:
* Reaction: If "action" refers to a response, the antonym could be a reaction (meaning something done without thinking).
* Omission: If "action" refers to doing something, the antonym could be an omission (meaning failing to do something).
* Reversal: If "action" refers to a movement in a specific direction, the antonym could be a reversal (meaning moving in the opposite direction).
It's important to consider the context when choosing an antonym for "action" to ensure the word fits appropriately.